Derivative Instruments and Hedging Activities (Foreign Currency Forward Contracts) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Notional amount	$ 9,275.0
Foreign currency forward contracts
Derivative [Line Items]
Period to settlement dates of derivatives is within this period	3 years
Designated as hedging instruments | Foreign currency forward contracts
Derivative [Line Items]
Period to settlement dates of derivatives is within this period	36 months	36 months
Notional amount	$ 3,915.0	$ 4,284.1
Not designated as hedging instruments | Foreign currency forward contracts
Derivative [Line Items]
Notional amount	920.0	835.5
Australian Dollar | Designated as hedging instruments | Foreign currency forward contracts
Derivative [Line Items]
Notional amount	45.1	18.8
British Pound | Designated as hedging instruments | Foreign currency forward contracts
Derivative [Line Items]
Notional amount	289.3	304.8
Canadian Dollar | Designated as hedging instruments | Foreign currency forward contracts
Derivative [Line Items]
Notional amount	135.9	43.7
Euro | Designated as hedging instruments | Foreign currency forward contracts
Derivative [Line Items]
Notional amount	2,934.3	3,375.7
Japanese Yen | Designated as hedging instruments | Foreign currency forward contracts
Derivative [Line Items]
Notional amount	$ 510.4	$ 541.1