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Depreciation of Revenue Earning Equipment and Lease Charges (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Jun. 30, 2013
Jun. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Depreciation of Revenue Earning Equipment and Lease Charges Disclosure [Abstract]                            
Depreciation of revenue earning equipment                       $ 2,407.8 $ 2,145.9 $ 1,912.3
Adjustment of depreciation upon disposal of revenue earning equipment                       37.2 (96.8) (112.2)
Rents paid for vehicles leased                       80.5 79.8 96.1
Total $ 674.9 $ 627.5 $ 580.1 $ 550.0 $ 556.7 $ 514.5 $ 508.7 $ 1,207.6 $ 1,023.2 $ 1,882.5 $ 1,579.9 $ 2,525.5 $ 2,128.9 $ 1,896.2