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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
Beginning Balance at Dec. 31, 2019	$ 3,071.0	$ 0.9	$ 524.8	$ 2,704.8	$ (159.5)
Beginning Balance (in shares) at Dec. 31, 2019		94,655
Common stock withheld and retired to cover taxes on vested stock awards	(10.4)	$ 0.0	(0.8)	(9.6)	0.0
Common stock withheld and retired to cover taxes on vested stock awards (in shares)		(107)
Common stock dividends declared	(150.5)	$ 0.0	0.0	(150.5)	0.0
Share-based compensation	18.7	$ 0.0	18.7	0.0	0.0
Share-based compensation expense (in shares)		287
Other	(0.1)	$ 0.0	0.0	(0.1)	0.0
Comprehensive income	204.4	0.0	0.0	198.3	6.1
Ending Balance at Jun. 30, 2020	3,133.1	$ 0.9	542.7	2,742.9	(153.4)
Ending Balance (in shares) at Jun. 30, 2020		94,835
Beginning Balance at Mar. 31, 2020	3,149.9	$ 0.9	534.9	2,771.1	(157.0)
Beginning Balance (in shares) at Mar. 31, 2020		94,848
Common stock withheld and retired to cover taxes on vested stock awards	(10.4)	$ 0.0	(0.8)	(9.6)	0.0
Common stock withheld and retired to cover taxes on vested stock awards (in shares)		(106,000)
Common stock dividends declared	(75.3)	$ 0.0	0.0	(75.3)	0.0
Share-based compensation	8.6	$ 0.0	8.6	0.0	0.0
Share-based compensation expense (in shares)		93
Comprehensive income	60.3	$ 0.0	0.0	56.7	3.6
Ending Balance at Jun. 30, 2020	3,133.1	$ 0.9	542.7	2,742.9	(153.4)
Ending Balance (in shares) at Jun. 30, 2020		94,835
Beginning Balance at Dec. 31, 2020	3,246.3	$ 0.9	554.4	2,835.5	(144.5)
Beginning Balance (in shares) at Dec. 31, 2020		94,830
Common stock withheld and retired to cover taxes on vested stock awards	(10.5)	$ (0.1)	(0.6)	(9.8)	0.0
Common stock withheld and retired to cover taxes on vested stock awards (in shares)		(77)
Common stock dividends declared	(190.9)	$ 0.0	0.0	(190.9)	0.0
Share-based compensation	20.8	$ 0.2	20.7	(0.1)	0.0
Share-based compensation expense (in shares)		226
Comprehensive income	378.6	$ 0.0	0.0	373.8	4.8
Ending Balance at Jun. 30, 2021	3,444.3	$ 1.0	574.5	3,008.5	(139.7)
Ending Balance (in shares) at Jun. 30, 2021		94,979
Beginning Balance at Mar. 31, 2021	3,331.2	$ 1.0	566.0	2,906.3	(142.1)
Beginning Balance (in shares) at Mar. 31, 2021		94,994
Common stock withheld and retired to cover taxes on vested stock awards	(10.4)	$ (0.1)	(0.6)	(9.7)	0.0
Common stock withheld and retired to cover taxes on vested stock awards (in shares)		(76)
Common stock dividends declared	(95.4)	$ 0.0	0.0	(95.4)	0.0
Share-based compensation	9.2	$ 0.1	9.1	0.0	0.0
Share-based compensation expense (in shares)		61
Comprehensive income	209.7	$ 0.0	0.0	207.3	2.4
Ending Balance at Jun. 30, 2021	$ 3,444.3	$ 1.0	$ 574.5	$ 3,008.5	$ (139.7)
Ending Balance (in shares) at Jun. 30, 2021		94,979

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