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Derivative Instruments (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Collateral in margin accounts	$ 11.2	$ 0
Derivative Asset	15.3us-gaap_DerivativeAssets	11.8us-gaap_DerivativeAssets
Derivative Liability	12.5us-gaap_DerivativeLiabilities	0.3us-gaap_DerivativeLiabilities
Reclassification in treasury lock agreement settlement payments deferred in Accumulated Other Comprehensive Income as increase to interest Expense	241.5us-gaap_InterestExpense	252.1us-gaap_InterestExpense	248.2us-gaap_InterestExpense
Derviative Instrument by Counterparty, Gross Amount Recognized on Balance Sheet [Member]
Derivative [Line Items]
Derivative Asset	15.3	11.8
Derivative Liability	12.5	0.3
Derviative Instrument by Counterparty, Gross Amount Not Offset on Balance Sheet [Member] [Member]
Derivative [Line Items]
Collateral in margin accounts	10.3	0
Derivative Asset	(0.4)	0
Derivative Liability	(11.5)	0
Derviative Instrument by Counterparty, Net Amount [Member]
Derivative [Line Items]
Derivative Asset	14.9	11.8
Derivative Liability	$ 1.0	$ 0.3

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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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or 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 liabilities not subject to a master netting arrangement and not elected to be offset.

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