Lease and Concession Agreements (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Lease and Concession Agreements
Rents paid for vehicles leased	$ 80.5	$ 79.8	$ 96.1
Revenue earning equipment, office and computer equipment
Lease and Concession Agreements
Rents paid for vehicles leased	94.4	89.3	103.6
Minimum obligations under existing agreements
Less than 1 Year	52.6
2014	16.0
2015	8.0
2016	1.2
2017	0
After 2017	0
Revenue earning equipment
Lease and Concession Agreements
Rents paid for vehicles leased	80.5	79.8	96.1
Office and computer equipment
Lease and Concession Agreements
Rents paid for vehicles leased	13.9	9.5	7.5
Concession agreements and real estate leases
Concession fees:
Total	884.7	722.2	696.3
Minimum obligations under existing agreements
Minimum future sublease rental inflows reduced from future minimum rent payments	20.4
Concession agreements and real estate leases | Maximum
Minimum obligations under existing agreements
Lease period of premises under operating leases	25 years
Rents
Lease and Concession Agreements
Rents paid for vehicles leased	185.3	142.3	135.9
Concession fees:
Sublease income that reduced rent expense	5.3	5.0	5.0
Minimum obligations under existing agreements
Less than 1 Year	141.3
2014	116.9
2015	88.9
2016	66.8
2017	46.5
After 2017	195.7
Concession rights
Concession fees:
Minimum fixed obligations	404.8	263.7	248.8
Additional amounts, based on revenues	294.6	316.2	311.6
Minimum obligations under existing agreements
Less than 1 Year	407.9
2014	310.3
2015	249.1
2016	188.9
2017	152.0
After 2017	$ 685.6