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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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