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Summary of Significant Accounting Policies Derivative instruments (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative [Line Items]
Unrealized (Loss) Gain on Derivatives	$ 374.4us-gaap_UnrealizedGainLossOnDerivatives	$ (88.7)us-gaap_UnrealizedGainLossOnDerivatives	$ 63.2us-gaap_UnrealizedGainLossOnDerivatives
Accumulated Other Comprehensive Income Loss, Cumulative Changes In Gain Loss From Cash Flow Hedges Effect, Before Tax				395.9
Unrealized gains on derivative contracts, net of tax				$ 248.6

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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