Changes in Shareholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Equity [Abstract]
Shareholders’ Equity at Beginning of Year			$ 1,992.4
Net Income			1.9
Other Comprehensive Income	$ 70.4	$ (115.0)	136.8	$ (77.4)
Cash Dividends and Dividend Equivalents to Shareholders ($0.48 per share)			(24.5)
Repurchases of Common Stock			(3.8)
Equity-based Compensation Cost			3.1
Equity-based Awards, Net of Shares Exchanged			(0.7)
Shareholders' Equity at End of Period	$ 2,105.2		$ 2,105.2