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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Recorded compensation cost for stock based payment arrangements, net of tax | $ 22.0 | $ 36.0 | $ 43.0
Recognized tax benefits for stock based payment arrangements | 5.0 | $ 8.0 | $ 10.0
Options outstanding, aggregate intrinsic value (in shares) | 5.0 |  |
Options exercisable, aggregate intrinsic value | $ 0.0 |  |
RSU or Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
VDI units granted (in shares) | 1,355,975 | 1,356,303 | 603,111
Weighted-average grant date fair value (in dollars per share) | $ 10.30 | $ 32.68 | $ 57.88
Restricted shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Fair value of restricted stock units and shares vested | $ 5.0 | $ 14.0 | $ 28.0
Balance of unamortized expense | $ 10.0 |  |
Weighted average period of recognition of unamortized expense | 1 year 4 months 24 days |  |
Stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Balance of unamortized expense | $ 6.0 |  |
Weighted average period of recognition of unamortized expense | 2 years 2 months 12 days |  |
Expiration term | 10 years |  |
Aggregate intrinsic value of stock options exercised | $ 0.0 | $ 0.3 | 2.0
Blend of historical and implied volatility (ratio) | 50.00% | 50.00% |
Performance-based awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Balance of unamortized expense | $ 16.0 | $ 14.0 |
Unamortized compensation expense | 0.1 |  |
SGI Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Balance of unamortized expense | 29.0 | 8.0 |
Corporate general and administrative expense | RSU or Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Recognized compensation expense | 17.0 | 32.0 | 30.0
Corporate general and administrative expense | Stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Recognized compensation expense | 5.0 | 4.0 | 4.0
Corporate general and administrative expense | Performance-based awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Recognized compensation expense |  | 1.0 | 9.0
Fully vested awards that were settled in cash | 3.0 | 8.0 | 10.0
Corporate general and administrative expense | SGI Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Fully vested awards that were settled in cash | $ 25.0 | $ 6.0 | $ 6.0
Executives | RSU or Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 5 years |  |
Grants in the period (in shares) | 1 |  |
Executives | Stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 5 years |  |
Executives | Performance-based awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
VDI units granted (in shares) | 1,156,365 | 350,532 | 206,598
2019 VDI Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
VDI units granted (in shares) | 385,455 |  |
Weighted-average grant date fair value (in dollars per share) | $ 9.05 |  |
2018 VDI Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
VDI units granted (in shares) | 116,844 |  |
Weighted-average grant date fair value (in dollars per share) | $ 9.77 |  |
2017 VDI Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
VDI units granted (in shares) | 68,866 |  |
Weighted-average grant date fair value (in dollars per share) | $ 10.75 |  |
Maximum | Performance-based awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average period of recognition of unamortized expense | 2 months 12 days |  |

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