Changes in Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Shareholders' Equity [Abstract]
Shareholders’ Equity at Beginning of Year			$ 2,090.7
Net Income	$ 29.7	$ 9.3	43.2	$ 44.4
Other Comprehensive Loss	$ (115.0)	$ 64.4	(77.4)	$ 143.3
Cash Dividends and Dividend Equivalents to Shareholders ($0.48 per share)			$ (24.8)
Dividends Paid to Shareholders Per Share (in dollars per share)	$ 0.24	$ 0.24	$ 0.48	$ 0.48
Repurchases of Common Stock			$ (23.7)
Equity-based Compensation Cost			3.9
Equity-based Awards, Net of Shares Exchanged			0.4
Shareholders’ Equity at End of Period	$ 2,012.3		$ 2,012.3