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Earnings Per Share and Equity - Narrative (Details) - USD ($) |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 01, 2014 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 07, 2020 | Nov. 30, 2018 | Nov. 15, 2018 | Mar. 31, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |
Anti-dilutive shares (in shares) |  | 800,000 | 800,000 | 600,000 |  |  |  |
Amount remaining to be repurchased under the stock repurchase program |  | $ 1,295,800,000 | $ 1,361,100,000 | $ 1,500,000,000.0 |  |  |  |
Common stock repurchased |  | 65,300,000 | 138,900,000 | 315,000,000.0 |  |  |  |
Payments of tax withholding for restricted shares |  | $ 20,000,000.0 | 33,500,000 | 31,600,000 |  |  |  |
Shares reissued or retired (in shares) |  | 0 |  |  |  |  |  |
Noncontrolling interest balance |  | $ 19,600,000 | 22,400,000 |  |  |  |  |
Income attributable to non-controlling interests |  | 2,200,000 | 2,200,000 | 2,500,000 |  |  |  |
Dividend to non-controlling shareholder |  | $ 5,000,000.0 | $ 2,300,000 | $ 2,200,000 |  |  |  |
Rights Agreement | Series B Preferred Stock |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |
Exercise price, warrants (in dollars per share) |  |  |  |  | $ 100.80 |  |  |
Dividend declared (in shares) |  |  |  |  | 1 |  |  |
Preferred stock par value (in dollars per share) |  |  |  |  | $ 0.01 |  |  |
Minimum beneficial ownership to trigger exercise option |  |  |  |  | 15.00% |  |  |
Leshan |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |
Ownership percentage |  | 80.00% |  |  |  |  |  |
Noncontrolling interest balance |  | $ 19,600,000 |  |  |  |  |  |
OSA |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |
Ownership percentage |  | 100.00% |  | 60.00% |  |  |  |
Additional ownership percentage acquired |  | 40.00% |  | 50.00% |  |  |  |
Equity interest value |  |  |  | $ 24,600,000 |  |  |  |
Settlement of purchase price |  | $ 26,000,000.0 |  |  |  |  |  |
Treasury Stock |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |
Shares withheld for payment of taxes (in shares) |  | 1,062,377 | 1,620,543 | 1,343,961 |  |  |  |
Noncontrolling Interest |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |
Dividend to non-controlling shareholder |  | $ 5,000,000.0 | $ 2,300,000 | $ 2,200,000 |  |  |  |
2014 Program |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |
Cash allocation policy, target percentage to return to shareholders | 80.00% |  |  |  |  |  |  |
Authorized repurchases | $ 1,000,000,000.0 |  |  |  |  |  |  |
Period in which the company intends to repurchase the shares | 4 years |  |  |  |  |  |  |
Amount remaining to be repurchased under the stock repurchase program |  |  |  |  |  | $ 288,200,000 |  |
Common stock repurchased |  |  |  | $ 315,000,000.0 |  |  |  |
2018 Program |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |
Authorized repurchases |  |  |  |  |  |  | $ 1,500,000,000 |
Amount remaining to be repurchased under the stock repurchase program |  | 1,295,800,000 |  |  |  |  |  |
Common stock repurchased |  | $ 65,300,000 | $ 138,900,000 |  |  |  |  |
1.00% Notes | Convertible Debt |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate |  | 1.00% |  |  |  |  |  |
Exercise price, warrants (in dollars per share) |  | $ 25.96 |  |  |  |  |  |
1.625% Notes | Convertible Debt |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate |  | 1.625% | 1.625% |  |  |  |  | 1.625%
Exercise price, warrants (in dollars per share) |  | $ 30.70 |  |  |  |  |  |
Conversion price per share (in dollars per share) |  | $ 20.72 |  |  |  |  |  | $ 20.72

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