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Consolidated Statement of Change in Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Shares Held in Trust [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	$ 1.6
Balances (in shares) at Dec. 31, 2014		44,828,779
Balances at Dec. 31, 2014	2,409.1	$ 0.4	$ 961.9	$ 1,631.1	$ (6.4)	$ (200.2)	$ 22.3
Increase (decrease) in shareholders' equity [Roll Forward]
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	444.8			438.7			6.1
Shares issued under stock compensation programs (in shares)		280,689
Shares issued under stock compensation programs	5.2	$ 0.1	5.1
Shares repurchased for payment of taxes on stock awards (in shares)		(59,965)
Shares repurchased for payment of taxes on stock awards	(10.1)	$ 0.0	(10.1)
Tax adjustments due to vestings and exercises	6.8		6.8
Amortization of stock compensation	22.7		22.7
Shares held in trust	(0.2)				(0.2)
Dividends paid	(25.6)			(25.6)
Change in pension liabilities, net of tax	27.6					27.6
Foreign currency translation adjustments	(163.7)					(163.7)
Increase (Decrease) in amount attributable to noncontrolling interest	1.1						1.1
Balances (in shares) at Dec. 31, 2015		45,049,503
Balances at Dec. 31, 2015	2,718.3	$ 0.5	986.6	2,044.2	(6.2)	(336.3)	29.5
Increase (decrease) in shareholders' equity [Roll Forward]
Redeemable Noncontrolling Interest, Equity, Redemption Value	0.2		0.2
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	0.1
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	334.3			318.2			16.1
Shares issued under stock compensation programs (in shares)		225,255
Shares issued under stock compensation programs	1.6	$ 0.0	1.6
Shares repurchased for payment of taxes on stock awards (in shares)		(60,926)
Shares repurchased for payment of taxes on stock awards	(7.0)	$ 0.0	(7.0)
Tax adjustments due to vestings and exercises	1.2		1.2
Amortization of stock compensation	30.1		30.1
Shares held in trust	(0.2)				(0.2)
Dividends paid	(29.4)			(29.4)
Change in pension liabilities, net of tax	(32.9)					(32.9)
Foreign currency translation adjustments	(181.9)					(181.9)
Increase (Decrease) in amount attributable to noncontrolling interest	(20.6)						(20.6)
Balances (in shares) at Dec. 31, 2016		45,213,832
Balances at Dec. 31, 2016	2,814.7	$ 0.5	1,013.3	2,333.0	(6.0)	(551.1)	25.0
Increase (decrease) in shareholders' equity [Roll Forward]
Redeemable Noncontrolling Interest, Equity, Redemption Value	0.8		0.8
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	(0.1)
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	257.4			254.2			3.2
Shares issued under stock compensation programs (in shares)		216,831
Shares issued under stock compensation programs	3.6		3.6
Shares repurchased for payment of taxes on stock awards (in shares)		(56,846)
Shares repurchased for payment of taxes on stock awards	(6.6)		(6.6)
Amortization of stock compensation	24.9		24.9
Shares held in trust	0.1				0.1
Dividends paid	(33.1)			(33.1)
Change in pension liabilities, net of tax	8.2					8.2
Foreign currency translation adjustments	201.1
Increase (Decrease) in amount attributable to noncontrolling interest	9.9						9.9
Balances (in shares) at Dec. 31, 2017		45,373,817
Balances at Dec. 31, 2017	3,281.3	$ 0.5	1,037.6	2,552.8	$ (5.9)	$ (341.8)	$ 38.1
Increase (decrease) in shareholders' equity [Roll Forward]
Cumulative Effect from Adoption of new accounting for stock-based compensation	0.0		1.3	$ (1.3)
Redeemable Noncontrolling Interest, Equity, Redemption Value	$ 1.1		$ 1.1

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