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Depreciation of Revenue Earning Equipment and Lease Charges (Tables)
 9 Months Ended
Sep. 30, 2012
Depreciation of Revenue Earning Equipment and Lease Charges Disclosure [Abstract]  
Depreciation of revenue earning equipment and lease charges
 
Three Months Ended
September 30,
 
2012
 
2011
Depreciation of revenue earning equipment
$
554.1

 
$
528.1

Adjustment of depreciation upon disposal of revenue earning equipment
(12.7
)
 
(30.9
)
Rents paid for vehicles leased
19.1

 
26.1

Total
$
560.5

 
$
523.3


 
Nine Months Ended
September 30,
 
2012
 
2011
Depreciation of revenue earning equipment
$
1,624.1

 
$
1,399.9

Adjustment of depreciation upon disposal of revenue earning equipment
(93.3
)
 
(93.3
)
Rents paid for vehicles leased
63.6

 
72.4

Total
$
1,594.4

 
$
1,379.0