CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions	Common Stock	Additional Paid-In Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Loss	Total
Balance at Dec. 31, 2018	$ 1.1	$ 3,172.4	$ (5,715.7)	$ 5,012.4	$ (138.1)	$ 2,332.1
Balance (in shares) at Dec. 31, 2018	113.0
Increase (Decrease) in Stockholders' Equity
Net income				149.1		149.1
Other comprehensive income (loss)					10.2	10.2
Stock-based compensation		20.1				20.1
Repurchases of common stock			(222.8)			(222.8)
Dividends and dividend equivalent rights declared				(33.7)		(33.7)
Other		(15.5)				(15.5)
Other (in shares)	0.2
Balance at Mar. 31, 2019	$ 1.1	3,177.0	(5,938.5)	5,127.8	(127.9)	2,239.5
Balance (in shares) at Mar. 31, 2019	113.2
Balance at Dec. 31, 2019	$ 1.1	3,257.7	(6,733.9)	5,163.3	(99.9)	1,588.3
Balance (in shares) at Dec. 31, 2019	115.0
Increase (Decrease) in Stockholders' Equity
Net income				30.0		30.0
Cumulative effect adjustment to retained earnings in accordance with ASU 2016-13				(485.0)		(485.0)
Other comprehensive income (loss)					(18.2)	(18.2)
Stock-based compensation		4.7				4.7
Dividends and dividend equivalent rights declared				(29.5)		(29.5)
Other	$ 0.1	(2.7)				(2.6)
Balance at Mar. 31, 2020	$ 1.2	$ 3,259.7	$ (6,733.9)	$ 4,678.8	$ (118.1)	$ 1,087.7
Balance (in shares) at Mar. 31, 2020	115.0