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v3.19.3.a.u2

Long-Term Debt - 1.625% Notes due 2023 (Details) $ / shares in Units, shares in Millions, $ in Millions |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2017 USD ($) trading_day d $ / shares Rate shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 19, 2019 USD ($) | Jun. 12, 2019 USD ($) | May 31, 2018 USD ($) | Nov. 30, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt issuance costs | $ 2.4 | $ 34.0 | $ 33.5 |  | $ 17.5 | $ 6.6 | $ 1.1 | $ 3.3
Conversion option recorded to equity |  |  |  | $ 113.1 |  |  |  |
Borrowings under debt agreements |  | 1,404.8 | 15.3 | 1,106.2 |  |  |  |
Conversion option, debt discount |  |  |  | (55.7) |  |  |  |
Payments for hedge |  | 0.0 | 0.0 | 144.7 |  |  |  |
Proceeds from issuance of warrants |  | $ 0.0 | $ 0.0 | $ 85.2 |  |  |  |
Senior Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  | 3.30% | 3.77% |  |  |  |  |
Borrowings used to enter into convertible note hedge and warrant transactions | 59.5 |  |  |  |  |  |  |
1.625% Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  | 1.625% |  |  |  |  |  |
Tax impact of coversion option and convertible note hedge and warrant transactions | 11.0 |  |  |  |  |  |  |
1.625% Notes | Convertible Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount of debt | $ 575.0 |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) | 1.625% | 1.625% | 1.625% |  |  |  |  |
Debt issuance costs | $ 13.7 | $ 6.9 | $ 8.5 |  |  |  |  |
Debt issuance costs capitalized | 11.1 |  |  |  |  |  |  |
Conversion option recorded to equity | 2.6 |  |  |  |  |  |  |
Borrowings under debt agreements | $ 562.1 |  |  |  |  |  |  |
Conversion rate | Rate | 4.82567% |  |  |  |  |  |  |
Conversion price per share (in dollars per share) | $ / shares | $ 20.72 | $ 20.72 |  |  |  |  |  |
Redemption price percentage | 100.00% |  |  |  |  |  |  |
Conversion option, debt discount | $ 115.7 |  |  |  |  |  |  |
Effective interest rate (as a percent) | 5.38% |  |  |  |  |  |  |
Exercise price, warrants (in dollars per share) | $ / shares | $ 30.70 |  |  |  |  |  |  |
Proceeds from issuance of warrants | $ 85.2 |  |  |  |  |  |  |
Debt Conversion One | 1.625% Notes | Convertible Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Threshold trading days | trading_day | 20 |  |  |  |  |  |  |
Threshold consecutive trading days | trading_day | 30 |  |  |  |  |  |  |
Threshold percentage of stock price trigger (greater than or equal to) | 130.00% |  |  |  |  |  |  |
Debt Conversion Two | 1.625% Notes | Convertible Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Threshold consecutive trading days | d | 5 |  |  |  |  |  |  |
Period immediately following consecutive trading days (in business days) | 5 days |  |  |  |  |  |  |
Ratio of trading price per 1000 principal amount (as a percent) (less than) | 0.98 |  |  |  |  |  |  |
Embedded Derivative Financial Instruments | 1.625% Notes | Convertible Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Conversion price per share (in dollars per share) | $ / shares | $ 20.72 |  |  |  |  |  |  |
Number of convertible shares | shares | 27.7 |  |  |  |  |  |  |
Payments for hedge | $ 144.7 |  |  |  |  |  |  |

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