Shareholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Jan. 01, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total stockholders’ equity, including adjustments	$ 1,257.6	$ 1,141.2	$ 1,185.1
Total stockholders’ equity, beginning balance	1,257.6	1,141.2
Cumulative effect of an accounting change			43.9
Net income	65.9	31.8
Other comprehensive income, net of tax	41.5	13.8
Recognition of stock-based compensation	10.4	10.2
Exercise of stock options	8.8	6.7
Dividends paid to noncontrolling interests	(0.4)	(1.5)
Total stockholders’ equity, ending balance	1,383.8	1,246.1
Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total stockholders’ equity, including adjustments	1,136.1	1,073.7	1,117.6
Total stockholders’ equity, beginning balance	1,136.1	1,073.7
Cumulative effect of an accounting change			43.9
Net income	64.1	30.9
Other comprehensive income, net of tax	40.6	13.8
Recognition of stock-based compensation	10.4	10.2
Exercise of stock options	8.8	6.7
Dividends paid to noncontrolling interests	0.0	0.0
Total stockholders’ equity, ending balance	1,260.0	1,179.2
Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total stockholders’ equity, including adjustments	121.5	67.5	$ 67.5
Total stockholders’ equity, beginning balance	121.5	67.5
Net income	1.8	0.9
Other comprehensive income, net of tax	0.9	0.0
Recognition of stock-based compensation	0.0	0.0
Exercise of stock options	0.0	0.0
Dividends paid to noncontrolling interests	(0.4)	(1.5)
Total stockholders’ equity, ending balance	$ 123.8	$ 66.9