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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, 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	(209.3)	$ 0.0	0.0	(209.3)	0.0
Adoption of ASC 606 | ASU 2014-09	1.6	0.0	0.0	1.6	0.0
Share-based compensation	17.8	$ 0.0	17.8	0.0	0.0
Share-based compensation expense (in shares)		216
Other	0.2	$ 0.0	0.4	(0.2)	0.0
Comprehensive income	545.2	0.0	0.0	533.4	11.8
Ending Balance at Sep. 30, 2018	2,530.2	$ 0.9	488.9	2,185.5	(145.1)
Ending Balance (in shares) at Sep. 30, 2018		94,497
Beginning Balance at Jun. 30, 2018	2,388.0	$ 0.9	482.1	2,054.0	(149.0)
Beginning Balance (in shares) at Jun. 30, 2018		94,500
Common stock withheld and retired to cover taxes on vested stock awards	(0.3)	$ 0.0	0.0	(0.3)	0.0
Common stock withheld and retired to cover taxes on vested stock awards (in shares)		(2)
Common stock dividends declared	(74.9)	$ 0.0	0.0	(74.9)	0.0
Share-based compensation	6.7	$ 0.0	6.7	0.0	0.0
Share-based compensation expense (in shares)		(1)
Other	0.0	$ 0.0	0.1	0.0	(0.1)
Comprehensive income	210.7	0.0	0.0	206.7	4.0
Ending Balance at Sep. 30, 2018	2,530.2	$ 0.9	488.9	2,185.5	(145.1)
Ending Balance (in shares) at Sep. 30, 2018		94,497
Beginning Balance at Dec. 31, 2018	2,672.4	$ 0.9	494.5	2,315.8	(138.8)
Beginning Balance (in shares) at Dec. 31, 2018		94,497
Common stock withheld and retired to cover taxes on vested stock awards	(8.1)	$ 0.0	(0.7)	(7.4)	0.0
Common stock withheld and retired to cover taxes on vested stock awards (in shares)		(87)
Common stock dividends declared	(224.7)	$ 0.0	0.0	(224.7)	0.0
Share-based compensation	25.1	$ 0.0	25.1	0.0	0.0
Share-based compensation expense (in shares)		250
Other	(0.2)	$ 0.0	0.0	(0.2)	0.0
Comprehensive income	570.2	0.0	0.0	560.2	10.0
Ending Balance at Sep. 30, 2019	3,034.7	$ 0.9	518.9	2,643.7	(128.8)
Ending Balance (in shares) at Sep. 30, 2019		94,660
Beginning Balance at Jun. 30, 2019	2,921.2	$ 0.9	513.3	2,539.2	(132.2)
Beginning Balance (in shares) at Jun. 30, 2019		94,666
Common stock withheld and retired to cover taxes on vested stock awards	(0.3)	$ 0.0	0.0	(0.3)	0.0
Common stock withheld and retired to cover taxes on vested stock awards (in shares)		(4)
Common stock dividends declared	(75.0)	$ 0.0	0.0	(75.0)	0.0
Share-based compensation	5.6	$ 0.0	5.6	0.0	0.0
Share-based compensation expense (in shares)		(2)
Other	0.0	$ 0.0	0.0	0.0	0.0
Comprehensive income	183.2	0.0	0.0	179.8	3.4
Ending Balance at Sep. 30, 2019	$ 3,034.7	$ 0.9	$ 518.9	$ 2,643.7	$ (128.8)
Ending Balance (in shares) at Sep. 30, 2019		94,660

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