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Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Millions | Total | Common Stock | Additional Paid in Capital | Retained Earnings | Accumulated Other Comprehensive Loss | Revision of Prior Period Adjustment Cumulative Effect Period of Adoption Adjustment | Revision of Prior Period Adjustment Cumulative Effect Period of Adoption Adjustment Common Stock | Revision of Prior Period Adjustment Cumulative Effect Period of Adoption Adjustment Additional Paid in Capital | Revision of Prior Period Adjustment Cumulative Effect Period of Adoption Adjustment Retained Earnings | Revision of Prior Period Adjustment Cumulative Effect Period of Adoption Adjustment Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2017 | $ 2,182.6 | $ 0.9 | $ 471.2 | $ 1,867.4 | $ (156.9) |  |  |  |  |
Beginning Balance (in shares) at Dec. 31, 2017 |  | 94,350 |  |  |  |  |  |  |  |
Common stock withheld and retired to cover taxes on vested stock awards | (7.9) | $ 0.0 | (0.5) | (7.4) | 0.0 |  |  |  |  |
Common stock withheld and retired to cover taxes on vested stock awards (in shares) |  | (69) |  |  |  |  |  |  |  |
Common stock dividends declared | (284.0) | $ 0.0 | 0.0 | (284.0) | 0.0 |  |  |  |  |
Share-based compensation expense | 23.5 | $ 0.0 | 23.5 | 0.0 | 0.0 |  |  |  |  |
Share-based compensation expense (in shares) |  | 216 |  |  |  |  |  |  |  |
Other | 0.5 | $ 0.0 | 0.3 | 0.2 | 0.0 |  |  |  |  |
Comprehensive income | 756.1 | 0.0 | 0.0 | 738.0 | 18.1 |  |  |  |  |
Ending Balance at Dec. 31, 2018 | 2,672.4 | $ 0.9 | 494.5 | 2,315.8 | (138.8) |  |  |  |  |
Ending Balance (in shares) at Dec. 31, 2018 |  | 94,497 |  |  |  |  |  |  |  |
Retained earnings | ASU 2014-09 |  |  |  |  |  | $ 1.6 | $ 0.0 | $ 0.0 | $ 1.6 | $ 0.0
Common stock withheld and retired to cover taxes on vested stock awards | (8.2) | $ 0.0 | (0.7) | (7.5) | 0.0 |  |  |  |  |
Common stock withheld and retired to cover taxes on vested stock awards (in shares) |  | (87) |  |  |  |  |  |  |  |
Common stock dividends declared | (299.7) | $ 0.0 | 0.0 | (299.7) | 0.0 |  |  |  |  |
Share-based compensation expense | 31.0 | $ 0.0 | 31.0 | 0.0 | 0.0 |  |  |  |  |
Share-based compensation expense (in shares) |  | 245 |  |  |  |  |  |  |  |
Other | (0.2) | $ 0.0 | 0.0 | (0.2) | 0.0 |  |  |  |  |
Comprehensive income | 675.7 | 0.0 | 0.0 | 696.4 | (20.7) |  |  |  |  |
Ending Balance at Dec. 31, 2019 | 3,071.0 | $ 0.9 | 524.8 | 2,704.8 | (159.5) |  |  |  |  |
Ending Balance (in shares) at Dec. 31, 2019 |  | 94,655 |  |  |  |  |  |  |  |
Retained earnings | 2,704.8 |  |  |  |  |  |  |  |  |
Common stock withheld and retired to cover taxes on vested stock awards | (10.5) | $ 0.0 | (0.8) | (9.7) | 0.0 |  |  |  |  |
Common stock withheld and retired to cover taxes on vested stock awards (in shares) |  | (108) |  |  |  |  |  |  |  |
Common stock dividends declared | (320.9) | $ 0.0 | 0.0 | (320.9) | 0.0 |  |  |  |  |
Share-based compensation expense | 30.8 | $ 0.0 | 30.8 | 0.0 | 0.0 |  |  |  |  |
Share-based compensation expense (in shares) |  | 283 |  |  |  |  |  |  |  |
Other | (0.1) | $ 0.0 | (0.4) | 0.3 | 0.0 |  |  |  |  |
Comprehensive income | 476.0 | 0.0 | 0.0 | 461.0 | 15.0 |  |  |  |  |
Ending Balance at Dec. 31, 2020 | 3,246.3 | $ 0.9 | $ 554.4 | $ 2,835.5 | $ (144.5) |  |  |  |  |
Ending Balance (in shares) at Dec. 31, 2020 |  | 94,830 |  |  |  |  |  |  |  |
Retained earnings | $ 2,835.5 |  |  |  |  |  |  |  |  |

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