Derivative Instruments and Hedging Activities (Outstanding Forward Foreign Exchange Contracts) (Details) (Foreign Exchange Forward [Member]) In Millions, unless otherwise specified	Dec. 31, 2014 British Pounds Sterling USD ($)	Dec. 31, 2014 British Pounds Sterling GBP (£)	Dec. 31, 2014 Australia, Dollars USD ($)	Dec. 31, 2014 Australia, Dollars AUD	Dec. 31, 2014 Canada, Dollars USD ($)	Dec. 31, 2014 Canada, Dollars CAD
Derivative [Line Items]
Foreign Currency Amount		£ 19.6		31.9		0.6
US Dollar Amount	$ 31.6		$ 28.7		$ 0.6
Weighted average exchange rate per $1 USD	0.62	0.62	1.11	1.11	1.09	1.09