Changes in Shareholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Shareholders' Equity [Abstract]
Shareholders’ Equity at Beginning of Year			$ 2,090.7
Net Income	$ 37.9	$ 4.7	81.1	$ 49.1
Other Comprehensive Loss	3.7	$ 2.8	(73.7)	$ 146.1
Cash Dividends and Dividend Equivalents to Shareholders ($0.72 per share)			(37.3)
Repurchases of Common Stock			(41.3)
Equity-based Compensation Cost			5.4
Equity-based Awards, Net of Shares Exchanged			(0.3)
Shareholders’ Equity at End of Period	$ 2,024.6		$ 2,024.6