Shareholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total stockholders’ equity, beginning balance			$ 1,112.0	$ 1,211.8
Net income	$ 36.4	$ (18.3)	58.8	33.8
Other comprehensive loss, net of tax	(67.9)	(27.0)	(154.9)	(36.4)
Exercise of stock options			66.4	3.0
Recognition of stock-based compensation			22.1	6.1
Issuances of common stock				2.3
Noncontrolling interests of acquired subsidiaries			4.3	(6.4)
Dividends declared to noncontrolling interests			(4.4)	(1.6)
Total stockholders’ equity, ending balance	1,104.3	1,212.6	1,104.3	1,212.6
Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total stockholders’ equity, beginning balance			1,044.7	1,142.9
Net income			55.1	29.6
Other comprehensive loss, net of tax			(152.6)	(34.2)
Exercise of stock options			66.4	3.0
Recognition of stock-based compensation			22.1	6.1
Issuances of common stock				2.3
Noncontrolling interests of acquired subsidiaries			0.0	(2.5)
Dividends declared to noncontrolling interests			0.0	0.0
Total stockholders’ equity, ending balance	1,035.7	1,147.2	1,035.7	1,147.2
Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total stockholders’ equity, beginning balance			67.3	68.9
Net income			3.7	4.2
Other comprehensive loss, net of tax			(2.3)	(2.2)
Exercise of stock options			0.0	0.0
Recognition of stock-based compensation			0.0	0.0
Issuances of common stock				0.0
Noncontrolling interests of acquired subsidiaries			4.3	(3.9)
Dividends declared to noncontrolling interests			(4.4)	(1.6)
Total stockholders’ equity, ending balance	$ 68.6	$ 65.4	$ 68.6	$ 65.4