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Commitments and Contingencies, additional lease information (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Commitments And Contingencies Disclosure [Abstract]      
Rent expense, noncancellable long-term operating lease $ 187.8 $ 204.1 $ 187.4
Rent expense, cancellable short-term operating lease 15.4 10.4 9.0
Rent revenue $ 45.7 $ 41.6 $ 39.2