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Long-Term Debt Interest Rate Caps (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Derivative Asset, Noncurrent	$ 0	$ 0.1
Derivative, Notional Amount	1,150.0
Interest Rate Cap Purchased During 2011 [Member]
Derivative [Line Items]
Derivative, Notional Amount	500.0
Derivative, Cap Interest Rate	3.50%
Interest Rate Cap Purchased During 2012 [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 650.0
Derivative, Cap Interest 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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