Consolidated Statement of Changes in Equity (unaudited) - 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]
Balances at Dec. 31, 2015						$ (336.3)
Increase (decrease) in shareholders' equity [Roll Forward]
Foreign currency translation adjustments	$ 13.8
Balances at Mar. 31, 2016						(322.5)
Common Stock, Shares, Issued	45,213,832
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	$ (0.1)
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]
Shares issued under stock compensation programs (in shares)		106,633
Shares issued under stock compensation programs	0.3		0.3
Shares repurchased for payment of taxes on stock awards (in shares)		(34,018)
Shares repurchased for payment of taxes on stock awards	(3.8)		(3.8)
Amortization of stock compensation	8.4		8.4
(Increase) Decrease In Common Stock Held In Trust	(0.2)				(0.2)
Foreign currency translation adjustments	61.1
Distributions to noncontrolling interest	3.1						3.1
Balances (in shares) at Mar. 31, 2017		45,286,447
Balances at Mar. 31, 2017	2,895.0	$ 0.5	1,019.5	2,342.5	$ (6.2)	$ (490.0)	28.7
Increase (decrease) in shareholders' equity [Roll Forward]
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	$ 11.4			10.8			$ 0.6
Common Stock, Shares, Issued	45,286,447
Cumulative Effect from Adoption of new accounting for stock-based compensation			$ 1.3	$ (1.3)