Derivative Instruments and Hedging Activities (Details) (Forward Foreign Exchange Contracts [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013 Foreign Exchange Risk of Intercompany Borrowing and Investment Activities [Member] Fair Value Hedge [Member] Designated as Hedging Instrument [Member]	Dec. 31, 2012 Foreign Exchange Risk of Intercompany Borrowing and Investment Activities [Member] Fair Value Hedge [Member] Designated as Hedging Instrument [Member]	Dec. 31, 2013 Foreign Exchange Risk of Revenue and Expenses Denominated in Different Currencies [Member] Fair Value Hedge [Member] Designated as Hedging Instrument [Member]	Dec. 31, 2012 Foreign Exchange Risk of Revenue and Expenses Denominated in Different Currencies [Member] Fair Value Hedge [Member] Designated as Hedging Instrument [Member]
Forward foreign exchange contracts, notional amount		$ 207.0	$ 181.5	$ 56.2	$ 63.6
Forward foreign exchange contracts, terms	The terms of our forward contracts are generally less than 90 days.