Interest Rate Swaps (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Interest Rate Swap [Member] \| Refinancings of Debt [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Income (loss) recognized in income discontinuation of hedge accounts	$ (63.1)
Interest Rate Contract [Member] \| Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Estimated amount expected to be reclassified into earnings from accumulated other comprehensive income (loss) during next twelve months	$ (18.7)

The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

Name:	us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant