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Fair Value Measurements Fair Value Measurements, Textual (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument, Fair Value Disclosure [Abstract]
Derivative Asset	95.1us-gaap_DerivativeAssets	$ 85.7us-gaap_DerivativeAssets
Minimum
Schedule of Available-for-sale Securities [Line Items]
Short-term investment maturity period	11 months
Maximum
Schedule of Available-for-sale Securities [Line Items]
Short-term investment maturity period	13 months
Derivative
Debt Instrument, Fair Value Disclosure [Abstract]
Fair Value, Net Asset (Liability)	(15.6)	$ (11.1)

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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