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Long-term Debt - Textual (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |
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Nov. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Sep. 30, 2017 USD ($) | May 31, 2017 USD ($) shares | Mar. 31, 2015 USD ($) | Nov. 30, 2013 USD ($) shares | Mar. 31, 2017 shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | Jan. 01, 2019 USD ($) | May 01, 2017 | Mar. 31, 2016 | Sep. 30, 2015 USD ($) | Aug. 31, 2015 USD ($) | Jan. 31, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2012 USD ($) | Sep. 11, 2012
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  | $ 7,700,000 | $ 0 | $ 10,700,000 |  |  |  |  |  |  |  |  |
Senior secured leverage ratio maximum |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible debt |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 319,400,000 |  |  |  |  |  |  |  |  |
Convertible senior subordinated notes (shares) | shares |  |  |  |  |  |  |  |  | 0 | 0 | 4,000,000.0 |  |  |  |  |  |  |  |  |
Finance lease obligations |  |  |  |  |  |  |  |  | $ 384,100,000 |  |  |  |  |  |  |  |  |  |  |
Term Loan Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum leverage ratio under the financial covenants | 4.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, (percent) |  |  |  |  |  |  |  |  | 101.00% |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares exchanged for convertible debt (shares) | shares |  |  |  |  |  |  | 257,110 |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible debt dividend rate (percent) |  |  |  |  |  |  | 6.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable |  |  |  |  |  |  |  |  | $ 45,000,000.0 | $ 30,000,000.0 |  |  |  |  |  |  |  |  |  |
The Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts outstanding under letter of credit facility |  |  |  |  |  |  |  |  | $ 38,900,000 | $ 37,400,000 |  |  |  |  |  |  |  |  |  |
The Credit Agreement | Term Loan Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee (percent) | 0.375% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior secured leverage ratio maximum | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment limit under the credit agreement's negative covenant | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum leverage ratio under the financial covenants | 4.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Credit Agreement | Fed Funds Effective Rate Overnight Index Swap Rate | Term Loan Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable rate (percent) | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Credit Agreement | LIBOR | Term Loan Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable rate (percent) | 1.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Credit Agreement | Term loan facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity | $ 270,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentageof aggregate principal amount outstanding (percent) | 1.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable interest rate under credit facility (percent) |  |  |  |  |  |  |  |  | 3.20% | 3.90% |  |  |  |  |  |  |  |  |  |
The Credit Agreement | Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity | 260,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 Credit Agreement | Term loan facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentageof aggregate principal amount outstanding (percent) |  |  |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  | $ 110,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  | 700,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 Credit Agreement | Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  | $ 260,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
5.125% Senior Notes due 2023 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable |  |  |  |  |  |  |  |  | $ 297,300,000 | $ 296,600,000 |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds for offering |  |  |  |  |  | $ 295,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate (percent) |  |  |  |  |  | 5.125% |  |  | 5.125% | 5.125% |  |  |  |  |  |  |  |  |  |
Effective interest rate (percent) |  |  |  |  |  | 5.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |
5.75% Senior Notes due 2024 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable |  |  |  |  |  |  |  |  | $ 697,300,000 | $ 1,194,700,000 |  |  |  |  |  |  |  |  |  |
Repayments of debt | $ 404,000,000 |  | $ 102,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, (percent) | 100.958% |  | 101.917% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 350,000,000 | $ 400,000,000 | $ 175,000,000 | $ 275,000,000 |
Debt issue price as percentage of principal (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.50% | 102.00% | 103.625% |  |
Debt instrument interest rate (percent) |  |  |  |  |  |  |  |  | 5.75% | 5.75% |  |  |  |  |  |  |  |  |  | 5.75%
Effective interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.80%
Debt redeemed | $ 400,000,000 |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
5.75% Senior Notes due 2025 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable |  |  |  |  |  |  |  |  | $ 345,600,000 | $ 345,000,000.0 |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 350,000,000 |  |  |  |  |
Debt instrument interest rate (percent) |  |  |  |  |  |  |  |  | 5.75% | 5.75% |  |  |  | 5.75% | 5.75% |  |  |  |  |
Effective interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.00% |  |  |  |  |
4.50% Senior Notes due 2028 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable |  |  |  |  |  |  |  |  | $ 491,700,000 | $ 0 |  |  |  |  |  |  |  |  |  |
Redemption price, (percent) |  | 4.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate (percent) |  | 4.50% |  |  |  |  |  |  | 4.50% |  |  |  |  |  |  |  |  |  |  |
4.75% Senior Notes due 2030 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable |  |  |  |  |  |  |  |  | $ 491,700,000 | $ 0 |  |  |  |  |  |  |  |  |  |
Redemption price, (percent) |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate (percent) |  | 4.75% |  |  |  |  |  |  | 4.75% |  |  |  |  |  |  |  |  |  |  |
2.00% Convertible Senior Subordinated Notes due 2043 [Member] | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate (percent) |  |  |  |  |  |  |  |  | 4.75% |  |  |  |  |  |  |  |  |  |  |
2.00% Convertible Senior Subordinated Notes due 2043 [Member] | Senior Subordinated Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  | $ 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  | $ 320,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate (percent) |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  | 6.00% |  |  |  |  |  |  |
Debt redeemed |  |  |  |  | $ 320,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument conversion rate |  |  |  |  | 0.0272221 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible debt |  |  |  |  | $ 319,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible debt, net of tax (shares) | shares |  |  |  |  | 8,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued due to make-whole premium (in shares) | shares |  |  |  |  | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible senior subordinated notes (shares) | shares |  |  |  |  |  |  |  | 8,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finance lease obligations |  |  |  |  |  |  |  |  |  |  |  | $ 52,000,000 |  |  |  |  |  |  |  |

X
- Definition We are restricted from paying common stock dividends, prepaying certain senior notes, and repurchasing preferred and common equity unless (1) we are not in default under the terms of the Credit Agreement and (2) the amount of such payments, when added to the aggregate amount of prior restricted payments (as defined in the Credit Agreement) does not exceed $200 million, which amount is subject to increase by a portion of excess cash flows each fiscal year. + References No definition available. + Details
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- Definition Max senior secured leverage ratio to permit restricted payments under credit agreement. + References No definition available. + Details
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- Definition Maximum leverage ratio in the financial covenants in the company's credit agreement. + References No definition available. + Details
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- Definition Par value of debt instrument issued plus or minus a premium or a discount. + References No definition available. + Details
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- Definition Percentage owed on principal amount outstanding for amounts drawn under the debt instrument. + References No definition available. + Details
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- Definition Number of shares issued during the period as a result of the conversion of convertible securities due to a make-whole premium. + References No definition available. + Details
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- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
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- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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