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Other Noncurrent Assets (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Components of other noncurrent assets    
Deferred financing costs, net $ 5.8 $ 2.0
Restricted cash 7.2 5.4
Other 7.8 9.3
Total $ 20.8 $ 16.7