CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Beginning Balance (in shares) at Dec. 31, 2020		91.6
Beginning Balance at Dec. 31, 2020	$ 2,434.4	$ 0.9	$ 1,234.0	$ 1,382.6	$ (187.4)	$ 4.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	55.5			55.4		0.1
Currency translation adjustments	(6.4)				(6.3)	(0.1)
Issuance of common stock for incentive stock programs, net of (payments of) taxes from withheld shares (in shares)		0.2
Issuance of common stock for incentive stock programs, net of (payments of) taxes from withheld shares	(1.6)		(1.6)
Stock-based compensation expense	12.2		12.2
Changes in noncontrolling interest	(0.6)					(0.6)
Ending Balance at Jun. 30, 2021	2,493.5	$ 0.9	1,244.6	1,438.0	(193.7)	3.7
Ending Balance (in shares) at Jun. 30, 2021		91.8
Beginning Balance (in shares) at Mar. 31, 2021		91.8
Beginning Balance at Mar. 31, 2021	2,448.8	$ 0.9	1,235.9	1,408.7	(200.3)	3.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	29.3			29.3
Currency translation adjustments	6.7				6.6	0.1
Issuance of common stock for incentive stock programs, net of (payments of) taxes from withheld shares	1.6		1.6
Stock-based compensation expense	7.1		7.1
Ending Balance at Jun. 30, 2021	2,493.5	$ 0.9	1,244.6	1,438.0	(193.7)	3.7
Ending Balance (in shares) at Jun. 30, 2021		91.8
Beginning Balance (in shares) at Dec. 31, 2021		91.9
Beginning Balance at Dec. 31, 2021	2,402.8	$ 0.9	1,261.8	1,354.8	(218.8)	4.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(3.6)			(3.8)		0.2
Currency translation adjustments	(54.9)				(54.4)	(0.5)
Issuance of common stock for incentive stock programs, net of (payments of) taxes from withheld shares (in shares)		0.2
Issuance of common stock for incentive stock programs, net of (payments of) taxes from withheld shares	(3.2)		(3.2)
Stock-based compensation expense	12.6		12.6
Ending Balance at Jun. 30, 2022	2,353.7	$ 0.9	1,271.2	1,351.0	(273.2)	3.8
Ending Balance (in shares) at Jun. 30, 2022		92.1
Beginning Balance (in shares) at Mar. 31, 2022		92.1
Beginning Balance at Mar. 31, 2022	2,381.4	$ 0.9	1,263.4	1,340.5	(227.3)	3.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	10.5			10.5
Currency translation adjustments	(46.0)				(45.9)	(0.1)
Stock-based compensation expense	7.8		7.8
Ending Balance at Jun. 30, 2022	$ 2,353.7	$ 0.9	$ 1,271.2	$ 1,351.0	$ (273.2)	$ 3.8
Ending Balance (in shares) at Jun. 30, 2022		92.1