Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Jan. 31, 2013	Mar. 31, 2012
Total exposure to floating rate interest rates	3.00%		2.00%
Foreign Exchange Contract [Member]
Notional amounts of foreign currency exchange contracts	$ 104.7
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	(2.3)	$ (8.0)
Intercompany Loans [Member]
Gain (loss) due to the effect of foreign currency exchange rates on intercompany loans	0.8	8.7
January 2013 Interest-Rate Swap Termination [Member]
Notional Amount Related to Discontinuation of Interest Rate Fair Value Hedge				$ 1,000.0
Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge	31.7			$ 90.4
Amortization of Interest Rate Swap Gains	3.7	3.7
March 2012 Interest-Rate Swap Termination [Member]
Notional Amount Related to Discontinuation of Interest Rate Fair Value Hedge					$ 350.0
Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge	21.1				$ 46.1
Amortization of Interest Rate Swap Gains	$ 1.7	$ 1.6