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Long-Term Debt - Additional Information (Detail) |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2019 USD ($) | Aug. 16, 2018 USD ($) | Apr. 24, 2018 | Feb. 15, 2017 USD ($) | Mar. 09, 2016 USD ($) | May 04, 2015 | Aug. 31, 2018 USD ($) | Mar. 31, 2018 USD ($) $ / shares | Feb. 28, 2014 USD ($) $ / shares | Mar. 31, 2014 USD ($) | Dec. 31, 2018 USD ($) Day $ / shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2018 USD ($) | Mar. 09, 2011 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal amount |  |  |  |  |  |  |  |  |  |  | $ 2,622,900,000 |  |  |  |
Credit facility, amount repaid |  |  |  |  |  |  |  |  |  |  | 1,231,900,000 | $ 483,100,000 |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  |  | 48,500,000 |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  | 181,000,000 | 160,800,000 | $ 99,300,000 |  |
Amortization of deferred financing costs |  |  |  |  |  |  |  |  |  |  | 7,300,000 | 8,400,000 | 7,900,000 |  |
Stock split conversion ratio |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Paid-in-capital in excess of par value |  |  |  |  |  |  |  |  |  |  | 341,500,000 | 407,300,000 |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | 2,453,800,000 | 2,268,100,000 |  |  |
Convertible notes paid |  |  |  |  |  |  |  |  |  |  | 582,500,000 |  |  |  |
Letters of credit issued but undrawn |  |  |  |  |  |  |  |  |  |  | 38,200,000 |  |  |  |
Capped call transactions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capped call transactions with financial institutions |  |  |  |  |  |  |  |  | $ 123,800,000 |  |  |  |  |  |
Prepaid forward share repurchase transactions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward share repurchase transactions amount |  |  |  |  |  |  |  |  | 685,800,000 | $ 685,800,000 |  |  |  |  |
Convertible Senior Notes Due 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal amount |  |  |  |  |  |  |  |  | 1,150,000,000 |  | 675,000,000 | 1,150,000,000 |  |  |
Deferred financing costs |  |  |  |  |  |  |  |  |  | 26,600,000 |  |  |  |  |
Aggregate principal amount of convertible senior notes issued |  |  |  |  |  |  |  |  | 1,000,000,000 |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  | 48,500,000 | 68,200,000 | 65,300,000 |  |
Non-cash interest expense |  |  |  |  |  |  |  |  |  |  | 29,800,000 | 41,200,000 | 38,600,000 |  |
Amortization of deferred financing costs |  |  |  |  |  |  |  |  |  |  | $ 2,900,000 | 4,000,000 | 3,800,000 |  |
Additional principal amount of convertible notes |  |  |  |  |  |  |  |  | $ 150,000,000 |  |  |  |  |  |
Convertible notes, interest rate |  |  |  |  |  |  |  |  | 2.00% |  | 2.00% |  |  |  |
Convertible notes maturity |  |  |  |  |  |  |  |  | Aug. 15, 2019 |  | Aug. 15, 2019 |  |  |  |
Convertible notes, conversion feature |  |  |  |  |  |  |  |  |  |  | Holders of the 2019 Convertible Notes may convert their notes at their option under the following circumstances: (i) during any calendar quarter commencing after the calendar quarter ending March 31, 2014, if the last reported sale price of the Company’s common shares for at least 20 trading days (whether or not consecutive) in a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter exceeds 130% of the conversion price for the 2019 Convertible Notes on each applicable trading day; (ii) during the five business-day period immediately after any five consecutive trading day period, or the measurement period, in which the trading price per $1,000 principal amount of 2019 Convertible Notes for each trading day of that measurement period was less than 98% of the product of the last reported sale price of the Company’s common shares and the conversion rate for the 2019 Convertible Notes for each such day; or (iii) upon the occurrence of specified corporate events. On and after May 15, 2019, holders may convert their 2019 Convertible Notes at any time, regardless of the foregoing circumstances. |  |  |  |
Convertible notes, number of trading days of threshold limit (whether or not consecutive) | Day |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |
Convertible notes, number of trading days of threshold limit in consecutive days | Day |  |  |  |  |  |  |  |  |  |  | 30 |  |  |  |
Minimum percentage of common share price over conversion price for conversion |  |  |  |  |  |  |  |  | 130.00% |  |  |  |  |  |
Principal amount of convertible notes |  |  |  |  |  |  |  |  | $ 1,000 |  | $ 1,000 |  |  |  |
Minimum percentage of the product of common share price and conversion rate for convertible notes |  |  |  |  |  |  |  |  | 98.00% |  |  |  |  |  |
Convertible notes conversion rate |  |  |  |  |  |  |  |  | 23.1816 |  | 23.2245 |  |  |  |
Convertible notes conversion price | $ / shares |  |  |  |  |  |  |  |  | $ 43.14 |  | $ 43.06 |  |  |  |
Stock split conversion ratio |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Closing price of common shares | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 58.95 |  |  |  |
Paid-in-capital in excess of par value |  |  |  |  |  |  |  |  | $ 219,100,000 | 5,100,000 |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  | $ 930,900,000 |  |  |  |  |  |
Effective interest rate on convertible notes |  |  |  |  |  |  |  |  | 6.20% |  |  |  |  |  |
Convertible notes paid |  |  |  |  |  |  |  | $ 583,500,000 |  |  |  |  |  |  |
Accrued interest |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |
Fair value of liability to convertible notes |  |  |  |  |  |  |  |  |  |  | $ 662,100,000 | 1,066,000,000 |  |  |
Unamortized debt discount and debt issuance costs |  |  |  |  |  |  |  |  |  |  | 18,600,000 | 80,000,000 |  |  |
Convertible senior notes, carrying value of liability component |  |  |  |  |  |  |  |  |  |  | 656,400,000 | 1,070,000,000 |  |  |
Convertible Senior Notes Due 2019 [Member] | Repurchase of 2019 Convertible Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  | 13,100,000 |  |  |  |  |  |  |
Repurchase of convertible notes |  |  |  |  |  |  |  | 475,000,000 |  |  |  |  |  |  |
Fair value of liability to convertible notes |  |  |  |  |  |  |  | 459,400,000 |  |  |  |  |  |  |
Fair value of equity component to convertible notes |  |  |  |  |  |  |  | 123,000,000 |  |  |  |  |  |  |
Reduction to long-term debt representing liability component of convertible notes |  |  |  |  |  |  |  | 446,400,000 |  |  |  |  |  |  |
Reduction to additional paid-in capital representing equity component |  |  |  |  |  |  |  | 123,000,000 |  |  |  |  |  |  |
Convertible Senior Notes Due 2019 [Member] | Debt Issuance Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs |  |  |  |  |  |  |  |  |  | $ 21,500,000 |  |  |  |  |
Convertible Senior Notes Due 2019 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of difference between aggregate principal amount and carrying value from additional paid in capital to temporary equity | $ 18,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes Due 2024 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal amount |  |  |  |  |  |  |  |  |  |  | 550,000,000 |  |  |  |
Deferred financing costs |  |  |  |  |  |  |  | 12,900,000 |  |  |  |  |  |  |
Aggregate principal amount of convertible senior notes issued |  |  |  |  |  |  |  | $ 550,000,000 |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  | 26,600,000 |  |  |  |
Non-cash interest expense |  |  |  |  |  |  |  |  |  |  | 14,500,000 |  |  |  |
Amortization of deferred financing costs |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |
Convertible notes, interest rate |  |  |  |  |  |  |  | 2.625% |  |  | 2.625% |  |  |  |
Convertible notes maturity |  |  |  |  |  |  |  | Mar. 15, 2024 |  |  | Mar. 15, 2024 |  |  |  |
Convertible notes, conversion feature |  |  |  |  |  |  |  |  |  |  | Holders of the 2024 Convertible Notes may convert their notes at their option under the following circumstances: (i) during any calendar quarter commencing after the calendar quarter ending June 30, 2018, if the last reported sale price of the Company’s common shares for at least 20 trading days (whether or not consecutive) in a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter exceeds 130% of the conversion price for the 2024 Convertible Notes on each applicable trading day; (ii) during the five business-day period immediately after any five consecutive trading day period, or the measurement period, in which the trading price per $1,000 principal amount of 2024 Convertible Notes for each trading day of that measurement period was less than 98% of the product of the last reported sale price of the Company’s common shares and the conversion rate for the 2024 Convertible Notes for each such day; (iii) if the Company calls the 2024 Convertible Notes for redemption; or (iv) upon the occurrence of specified corporate events. On and after December 15, 2023, holders may convert their 2024 Convertible Notes at any time, regardless of the foregoing circumstances. |  |  |  |
Convertible notes, number of trading days of threshold limit (whether or not consecutive) | Day |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |
Convertible notes, number of trading days of threshold limit in consecutive days | Day |  |  |  |  |  |  |  |  |  |  | 30 |  |  |  |
Minimum percentage of common share price over conversion price for conversion |  |  |  |  |  |  |  | 130.00% |  |  |  |  |  |  |
Principal amount of convertible notes |  |  |  |  |  |  |  | $ 1,000 |  |  | $ 1,000 |  |  |  |
Minimum percentage of the product of common share price and conversion rate for convertible notes |  |  |  |  |  |  |  | 98.00% |  |  |  |  |  |  |
Convertible notes conversion rate |  |  |  |  |  |  |  | 16.0056 |  |  | 16.0352 |  |  |  |
Convertible notes conversion price | $ / shares |  |  |  |  |  |  |  | $ 62.48 |  |  | $ 62.36 |  |  |  |
Stock split conversion ratio |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Paid-in-capital in excess of par value |  |  |  |  |  |  |  | $ 139,900,000 |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  | $ 410,100,000 |  |  |  |  |  |  |
Effective interest rate on convertible notes |  |  |  |  |  |  |  | 8.40% |  |  |  |  |  |  |
Fair value of liability to convertible notes |  |  |  |  |  |  |  |  |  |  | $ 448,100,000 |  |  |  |
Unamortized debt discount and debt issuance costs |  |  |  |  |  |  |  |  |  |  | 134,000,000 |  |  |  |
Convertible senior notes, carrying value of liability component |  |  |  |  |  |  |  |  |  |  | 416,000,000 |  |  |  |
Deferred financing costs recorded as additional paid-in-capital in excess of par value |  |  |  |  |  |  |  | $ 3,300,000 |  |  |  |  |  |  |
Convertible Senior Notes Due 2024 [Member] | Debt Issuance Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs |  |  |  |  |  |  |  | $ 9,600,000 |  |  |  |  |  |  |
Senior Notes Due 2026 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal amount |  |  |  |  |  |  |  |  |  |  | 400,000,000 |  |  |  |
Deferred financing costs |  |  |  |  |  |  |  |  |  |  | 5,200,000 |  |  | $ 5,400,000 |
Aggregate principal amount of convertible senior notes issued |  |  |  |  |  |  | $ 400,000,000 |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  | 11,100,000 |  |  |  |
Amortization of deferred financing costs |  |  |  |  |  |  |  |  |  |  | $ 200,000 |  |  |  |
Convertible notes, interest rate |  |  |  |  |  |  | 7.25% |  |  |  | 7.25% |  |  |  |
Convertible notes maturity |  |  |  |  |  |  | Aug. 15, 2026 |  |  |  | Aug. 15, 2026 |  |  |  |
Senior notes, redemption price, percentage |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Senior notes, redemption price percentage with equity offerings |  |  |  |  |  |  | 107.25% |  |  |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |  |  |  | $ 394,800,000 |  |  |  |
Fair value of notes |  |  |  |  |  |  |  |  |  |  | 394,600,000 |  |  |  |
Senior Notes Due 2026 [Member] | Debt Issuance Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,400,000 |
Minimum [Member] | Convertible Senior Notes Due 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal amount |  |  |  |  |  |  |  |  |  |  | $ 249,100,000 |  |  |  |
Maximum [Member] | Senior Notes Due 2026 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of aggregate pricipal amount of senior notes being redeemed |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |  |
2011 Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, amount repaid |  |  |  |  |  |  |  |  |  |  |  | 410,000,000 | 429,700,000 |  |
Credit facility, amount borrowed |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 24,100,000 |  |
Amortization of deferred financing costs |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,100,000 |  |
2011 Credit Facility [Member] | 2011 Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 700,000,000
Credit facility amendment date |  |  |  |  |  |  |  |  |  |  | May 04, 2015 |  |  |  |
Line of credit facility extended maturity period |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |
Amended maturity date of credit facility |  |  |  |  |  |  |  |  |  |  | Mar. 09, 2017 |  |  |  |
Repayment of prior senior secured credit facility |  |  |  | $ 410,000,000 |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility termination date |  |  |  |  |  |  |  |  |  |  | Feb. 15, 2017 |  |  |  |
2011 Credit Facility [Member] | 2011 Revolving Credit Facility [Member] | LIBOR [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  |  |  |  |  | 4.00% |  |  |  |  |  |  |  |  |
2011 Credit Facility [Member] | 2011 Revolving Credit Facility [Member] | LIBOR [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |
2011 Credit Facility [Member] | 2011 Revolving Credit Facility [Member] | Base Rate [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |
2011 Credit Facility [Member] | 2011 Revolving Credit Facility [Member] | Base Rate [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  |  |  |  |  | 4.00% |  |  |  |  |  |  |  |  |
2011 Credit Facility [Member] | 2011 Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000
Credit facility amendment date |  |  |  |  |  |  |  |  |  |  | Jul. 26, 2012 |  |  |  |
Credit facility, maturity date |  |  |  |  |  |  |  |  |  |  | Mar. 09, 2016 |  |  |  |
Repayment of prior senior secured credit facility |  |  |  |  | $ 229,700,000 |  |  |  |  |  |  |  |  |  |
2011 Credit Facility [Member] | 2011 Term Loan [Member] | LIBOR [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |
2011 Credit Facility [Member] | 2011 Term Loan [Member] | LIBOR [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |
2011 Credit Facility [Member] | 2011 Term Loan [Member] | Base Rate [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |
2011 Credit Facility [Member] | 2011 Term Loan [Member] | Base Rate [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |
2017 Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum amount |  |  |  | 1,450,000,000 |  |  |  |  |  |  |  |  |  |  |
Credit Facility amended, effective date |  |  |  |  |  |  |  |  |  |  | Mar. 16, 2018 |  |  |  |
Deferred financing costs |  |  |  | $ 22,600,000 |  |  |  |  |  |  |  |  |  |  |
Credit facility, amount repaid |  | $ 1,178,100,000 |  |  |  |  |  |  |  |  | $ 1,226,900,000 | $ 73,100,000 |  |  |
Long-term debt, weighted average interest rate |  |  |  |  |  |  |  |  |  |  |  | 6.79% |  |  |
Credit facility, amount borrowed |  |  |  |  |  |  |  |  |  |  |  | $ 1,300,000,000 |  |  |
Borrowings under the senior secured credit facility |  |  |  |  |  |  |  |  |  |  |  | 1,226,900,000 |  |  |
Foreign currency borrowings, outstanding |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
2017 Credit Facility [Member] | Other Expense (Income), Net [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  |  | $ 35,400,000 |  |  |  |
2017 Credit Facility [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |
2017 Credit Facility [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base rate interest rate floor |  |  |  | 1.75% |  |  |  |  |  |  |  |  |  |  |
2017 Credit Facility [Member] | Federal Funds Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |
2017 Credit Facility [Member] | 2017 Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum amount |  |  |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |
Credit facility, maturity date |  |  |  |  |  |  |  |  |  |  | Feb. 15, 2022 |  |  |  |
Repayment of prior senior secured credit facility |  | 1,178,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility LIBOR minimum floor rate interest |  |  |  | 0.75% |  |  |  |  |  |  |  |  |  |  |
Borrowings under the senior secured credit facility |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
2017 Credit Facility [Member] | 2017 Revolving Credit Facility [Member] | Base Rate [Member] | Scenario Leverage Ratio One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  |  |  | 3.50% |  |  |  |  |  |  |  |  |  |  |
2017 Credit Facility [Member] | 2017 Revolving Credit Facility [Member] | Base Rate [Member] | Scenario Leverage Ratio Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  |  |  | 3.75% |  |  |  |  |  |  |  |  |  |  |
2017 Credit Facility [Member] | 2017 Revolving Credit Facility [Member] | Eurodollar [Member] | Scenario Leverage Ratio One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  |  |  | 4.50% |  |  |  |  |  |  |  |  |  |  |
2017 Credit Facility [Member] | 2017 Revolving Credit Facility [Member] | Eurodollar [Member] | Scenario Leverage Ratio Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  |  |  | 4.75% |  |  |  |  |  |  |  |  |  |  |
2017 Credit Facility [Member] | 2017 Term Loan B [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maturity date |  |  |  |  |  |  |  |  |  |  | Feb. 15, 2023 |  |  |  |
Outstanding principal amount |  |  |  | $ 1,300,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior secured credit facility, discount percentage |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |
Senior secured credit facility, discount amount |  |  |  | $ 26,000,000 |  |  |  |  |  |  |  |  |  |  |
Borrowings under the senior secured credit facility |  |  |  |  |  |  |  |  |  |  |  | 1,226,900,000 |  |  |
2017 Credit Facility [Member] | 2017 Term Loan B [Member] | Level 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal amount |  |  |  |  |  |  |  |  |  |  |  | 1,190,200,000 |  |  |
Debt instrument, fair value |  |  |  |  |  |  |  |  |  |  |  | 1,226,100,000 |  |  |
2017 Credit Facility [Member] | 2017 Term Loan B [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  |  |  | 4.50% |  |  |  |  |  |  |  |  |  |  |
2017 Credit Facility [Member] | 2017 Term Loan B [Member] | Eurodollar [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  |  |  | 5.50% |  |  |  |  |  |  |  |  |  |  |
2017 Credit Facility [Member] | 2017 Term Loan B [Member] | 2017 Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility termination date |  |  |  |  |  |  |  |  |  |  | Aug. 16, 2018 |  |  |  |
2018 Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum amount |  | 1,250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs |  | 11,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, amount repaid |  |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  |  |  |
Line of credit facility, frequency of interest payments |  |  |  |  |  |  |  |  |  |  | quarterly |  |  |  |
Long-term debt, weighted average interest rate |  |  |  |  |  |  |  |  |  |  | 6.80% |  |  |  |
Credit facility, amount borrowed |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |
Borrowings under the senior secured credit facility |  |  |  |  |  |  |  |  |  |  | 995,000,000 |  |  |  |
Foreign currency borrowings, outstanding |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
2018 Credit Facility [Member] | Minimum [Member] | 2019 Convertible Notes Exceeds 350 Million [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal amount |  | 350,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Credit Facility [Member] | Minimum [Member] | 2024 Convertible Notes Exceeds 350 Million [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal amount |  | $ 350,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Credit Facility [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Credit Facility [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base rate interest rate floor |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Credit Facility [Member] | Federal Funds Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Credit Facility [Member] | 2018 Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum amount |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maturity date |  | Aug. 16, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings under the senior secured credit facility |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |
2018 Credit Facility [Member] | 2018 Revolving Credit Facility [Member] | 2019 Convertible Notes Exceeds 350 Million [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maturity date |  | Feb. 14, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Credit Facility [Member] | 2018 Revolving Credit Facility [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Credit Facility [Member] | 2018 Revolving Credit Facility [Member] | Eurodollar [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Credit Facility [Member] | 2018 Term Loan A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maturity date |  | Aug. 16, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal amount |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Voluntary prepayment premium percentage |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |
Borrowings under the senior secured credit facility |  |  |  |  |  |  |  |  |  |  | $ 246,900,000 |  |  |  |
2018 Credit Facility [Member] | 2018 Term Loan A [Member] | Level 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal amount |  |  |  |  |  |  |  |  |  |  | 245,400,000 |  |  |  |
Debt instrument, fair value |  |  |  |  |  |  |  |  |  |  | $ 240,700,000 |  |  |  |
2018 Credit Facility [Member] | 2018 Term Loan A [Member] | 2019 Convertible Notes Exceeds 350 Million [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maturity date |  | Feb. 14, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Credit Facility [Member] | 2018 Term Loan A [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Credit Facility [Member] | 2018 Term Loan A [Member] | Eurodollar [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Credit Facility [Member] | 2018 Term Loan B [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maturity date |  | Aug. 18, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal amount |  | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Senior secured credit facility, discount percentage |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |
Senior secured credit facility, discount amount |  | $ 1,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Voluntary prepayment premium percentage |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |
Borrowings under the senior secured credit facility |  |  |  |  |  |  |  |  |  |  | $ 748,100,000 |  |  |  |
2018 Credit Facility [Member] | 2018 Term Loan B [Member] | Level 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal amount |  |  |  |  |  |  |  |  |  |  | 738,200,000 |  |  |  |
Debt instrument, fair value |  |  |  |  |  |  |  |  |  |  | 729,300,000 |  |  |  |
2018 Credit Facility [Member] | 2018 Term Loan B [Member] | 2019 Convertible Notes Exceeds 350 Million [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maturity date |  | May 16, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Credit Facility [Member] | 2018 Term Loan B [Member] | 2024 Convertible Notes Exceeds 350 Million [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maturity date |  | Dec. 15, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Credit Facility [Member] | 2018 Term Loan B [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  | 2.25% |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Credit Facility [Member] | 2018 Term Loan B [Member] | Eurodollar [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  | 3.25% |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of convertible senior notes issued |  | $ 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
2018 and 2017 Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  | 83,600,000 |  |  |  |
Non-cash interest expense |  |  |  |  |  |  |  |  |  |  | 2,900,000 |  |  |  |
Amortization of deferred financing costs |  |  |  |  |  |  |  |  |  |  | $ 3,200,000 |  |  |  |
2017 and 2011 Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  | 87,000,000 |  |  |
Non-cash interest expense |  |  |  |  |  |  |  |  |  |  |  | 4,200,000 |  |  |
Amortization of deferred financing costs |  |  |  |  |  |  |  |  |  |  |  | $ 4,400,000 |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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