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]	Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
Balances at Dec. 31, 2014						$ (200.2)
Increase (decrease) in shareholders' equity [Roll Forward]
Foreign currency translation adjustments	$ (109.1)
Balances at Mar. 31, 2015						(308.4)
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]
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	25.7			25.7
Shares issued under stock compensation programs (in shares)		94,169
Shares issued under stock compensation programs	0.6		0.6
Shares repurchased for payment of taxes on stock awards (in shares)		(27,165)
Shares repurchased for payment of taxes on stock awards	(3.5)		(3.5)
Tax adjustments due to vestings and exercises	1.1		1.1
Amortization of stock compensation	10.1		10.1
Foreign currency translation adjustments	13.8					13.8
Distributions to noncontrolling interest	24.8						24.8
Balances (in shares) at Mar. 31, 2016		45,116,507.000
Balances at Mar. 31, 2016	2,790.9	$ 0.5	$ 994.9	$ 2,069.9	$ (6.2)	$ (322.5)	$ 54.3
Increase (decrease) in shareholders' equity [Roll Forward]
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	$ (0.5)