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Long-Term Debt -Interest Rate Caps (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Cap agreement effective January 14, 2013-2015 [Member]	Dec. 31, 2013 Cap agreement effective January 14, 2013-2015 [Member]	Sep. 30, 2014 Cap agreement effective January 14, 2015-2017 [Member]	Sep. 30, 2014 Interest Rate Cap Purchased During 2011 [Member]	Sep. 30, 2014 Interest Rate Cap Purchased During 2012 [Member]	Sep. 30, 2014 Interest rate cap purchased during 2014 [Member]
Derivative [Line Items]
Derivative, Notional Amount			$ 1,150.0			$ 500.0	$ 650.0	$ 250.0
Interest rate cap agreements premiums paid	0.7	0
Interest Rate Cap, cap rate						3.50%	1.50%	2.00%
Interest Rate Cap, fair value			$ 0	$ 0	$ 0.6

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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