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Long-Term Debt -Interest Rate Caps (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Interest Rate Cap, fair value	$ 0	$ 0
Cap agreement effective January 14, 2013-2015 [Member]
Derivative [Line Items]
Derivative, Notional Amount	1,150.0
Interest Rate Cap Purchased During 2011 [Member]
Derivative [Line Items]
Derivative, Notional Amount	500.0
Interest Rate Cap, cap rate	3.50%
Interest Rate Cap Purchased During 2012 [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 650.0
Interest Rate Cap [Member] \| Interest Rate Cap Purchased During 2012 [Member]
Derivative [Line Items]
Interest Rate Cap, cap rate	1.50%

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, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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