Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Treasury Stock [Member]
Beginning balance at Dec. 31, 2019	$ 5,116.1	$ 2.6	$ 4,266.9	$ 1,177.9	$ (253.0)	$ (78.3)
Beginning balance, shares at Dec. 31, 2019		257.6
Net income	99.2			99.2
Foreign exchange translation adjustment	(150.7)				(150.7)
Net change in interest rate swaps	(2.4)				(2.4)
Stock-based compensation expense	22.5		22.5
Exercise of options, net of withholding taxes	34.8		34.8
Exercise of options, net of withholding taxes, shares		1.4
Cash dividends declared	(31.9)		0.1	(32.0)
Ending balance at Mar. 31, 2020	5,087.6	$ 2.6	4,324.3	1,245.1	(406.1)	(78.3)
Ending balance, shares at Mar. 31, 2020		259.0
Beginning balance at Dec. 31, 2020	$ 5,716.5	$ 2.6	4,544.0	1,667.0	(201.0)	(296.1)
Beginning balance, shares at Dec. 31, 2020	263.9	263.9
Net income	$ 174.9			174.9
Foreign exchange translation adjustment	8.4				8.4
Net change in interest rate swaps	0.5				0.5
Stock-based compensation expense	27.8		27.8
Exercise of options, net of withholding taxes	28.7		28.7
Exercise of options, net of withholding taxes, shares		0.8
Cash dividends declared	(41.2)			(41.2)
Purchase of common stock	(181.4)					(181.4)
Ending balance at Mar. 31, 2021	$ 5,734.2	$ 2.6	$ 4,600.5	$ 1,800.7	$ (192.1)	$ (477.5)
Ending balance, shares at Mar. 31, 2021	264.7	264.7