Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Jan. 31, 2013	Mar. 31, 2012
Total exposure to floating rate interest rates	5.00%		5.00%		5.00%
Foreign Exchange Contract [Member]
Notional amounts of foreign currency exchange contracts	$ 144.4		$ 144.4
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	4.2	$ (5.1)	(3.9)	$ (5.2)
Intercompany Loans [Member]
Gain (loss) due to the effect of foreign currency exchange rates on intercompany loans	7.4	5.1	0.1	6.2
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	39.1		39.1			$ 90.4
Amortization of Interest Rate Swap Gains	3.6	3.5	10.9	10.7
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	24.5		24.5				$ 46.1
Amortization of Interest Rate Swap Gains	$ 1.6	$ 1.6	$ 4.9	$ 4.7