Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Paid-In Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interests	Total
Balance (in shares) at Dec. 31, 2020		190.5
Balance at Dec. 31, 2020		$ 2.0	$ 2,088.1	$ (215.2)	$ 937.4	$ (272.1)	$ 95.9	$ 2,636.1
Net income					127.9
Net income							2.7
Net income								130.6
Other comprehensive income						11.7	(1.0)	10.7
Stock-based compensation			17.0					17.0
Employee share purchase plan		0.1
Employee share purchase plan		$ 0.0	10.7					10.7
Exercise of stock options		0.1
Exercise of stock options		$ 0.0	1.0					1.0
Vesting of restricted stock units		0.9
Vesting of restricted stock units		$ 0.0						0.0
Treasury stock purchased		(0.3)
Treasury stock purchased				(28.5)				(28.5)
Dividends to shareholders					(14.5)			(14.5)
Balance (in shares) at Mar. 31, 2021		191.3
Balance at Mar. 31, 2021		$ 2.0	2,116.8	(243.8)	1,050.8	(260.3)	97.6	2,763.1
Balance (in shares) at Dec. 31, 2020		190.5
Balance at Dec. 31, 2020		$ 2.0	2,088.1	(215.2)	937.4	(272.1)	95.9	2,636.1
Net income	$ 255.6
Net income	263.5
Other comprehensive income	29.3
Balance (in shares) at Jun. 30, 2021		191.5
Balance at Jun. 30, 2021		$ 2.0	2,133.7	(249.2)	1,160.1	(241.9)	102.9	2,907.6
Balance (in shares) at Mar. 31, 2021		191.3
Balance at Mar. 31, 2021		$ 2.0	2,116.8	(243.8)	1,050.8	(260.3)	97.6	2,763.1
Net income	127.6				127.6
Net income							5.2
Net income	132.9							132.9
Other comprehensive income	18.6					18.5	0.1	18.6
Distributions to noncontrolling interests							(0.6)	(0.6)
Stock-based compensation			15.9					15.9
Exercise of stock options		0.2
Exercise of stock options		$ 0.0	1.0					1.0
Vesting of restricted stock units		0.1
Treasury stock purchased		(0.1)
Treasury stock purchased				(5.4)				(5.4)
Dividends to shareholders					(18.4)			(18.4)
Stockholders' Equity, Other			0.0				0.5	0.5
Balance (in shares) at Jun. 30, 2021		191.5
Balance at Jun. 30, 2021		$ 2.0	2,133.7	(249.2)	1,160.1	(241.9)	102.9	2,907.6
Balance (in shares) at Dec. 31, 2021		191.8
Balance at Dec. 31, 2021	4,006.2	$ 2.0	2,188.9	(252.0)	2,254.6	(285.4)	98.1	4,006.2
Net income					48.3
Net income							3.7
Net income								52.0
Other comprehensive income						100.7	(0.1)	100.6
Stock-based compensation			20.1					20.1
Employee share purchase plan		0.1
Employee share purchase plan		$ 0.0	10.0					10.0
Exercise of stock options		0.0
Exercise of stock options		$ 0.0	0.2					0.2
Vesting of restricted stock units		0.8
Vesting of restricted stock units		$ 0.0						0.0
Treasury stock purchased		(0.3)
Treasury stock purchased				(28.7)				(28.7)
Dividends to shareholders					(18.4)			(18.4)
Balance (in shares) at Mar. 31, 2022		192.4
Balance at Mar. 31, 2022		$ 2.0	2,219.2	(280.8)	2,284.5	(184.7)	101.7	4,141.9
Balance (in shares) at Dec. 31, 2021		191.8
Balance at Dec. 31, 2021	4,006.2	$ 2.0	2,188.9	(252.0)	2,254.6	(285.4)	98.1	4,006.2
Net income	143.9
Net income	151.6
Other comprehensive income	0.4
Balance (in shares) at Jun. 30, 2022		192.5
Balance at Jun. 30, 2022	4,138.9	$ 2.0	2,239.9	(281.2)	2,361.5	(283.5)	100.2	4,138.9
Balance (in shares) at Mar. 31, 2022		192.4
Balance at Mar. 31, 2022		$ 2.0	2,219.2	(280.8)	2,284.5	(184.7)	101.7	4,141.9
Net income	95.6				95.6
Net income							4.1
Net income	99.6							99.6
Other comprehensive income	(100.3)					(98.8)	(1.5)	(100.3)
Distributions to noncontrolling interests							(4.1)	(4.1)
Stock-based compensation			20.5					20.5
Exercise of stock options		0.1
Exercise of stock options		$ 0.0	0.2					0.2
Vesting of restricted stock units		0.0
Vesting of restricted stock units		$ 0.0						0.0
Treasury stock purchased		0.0
Treasury stock purchased				(0.4)				(0.4)
Dividends to shareholders					(18.6)			(18.6)
Balance (in shares) at Jun. 30, 2022		192.5
Balance at Jun. 30, 2022	$ 4,138.9	$ 2.0	$ 2,239.9	$ (281.2)	$ 2,361.5	$ (283.5)	$ 100.2	$ 4,138.9