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Cash Flow Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Supplemental Cash Flow Information [Abstract]
Non-cash investing and financing activities primarily related to capital leases	$ 11.6us-gaap_CapitalLeaseObligationsIncurred	$ 18.0us-gaap_CapitalLeaseObligationsIncurred	$ 82.2us-gaap_CapitalLeaseObligationsIncurred
Accrued purchases of property and equipment	16.3us-gaap_CapitalExpendituresIncurredButNotYetPaid	28.1us-gaap_CapitalExpendituresIncurredButNotYetPaid	23.6us-gaap_CapitalExpendituresIncurredButNotYetPaid
Interest payments including interest on vehicle inventory financing	136.4us-gaap_InterestPaid	136.0us-gaap_InterestPaid	119.6us-gaap_InterestPaid
Income tax payments, net of income tax refunds	$ 225.0us-gaap_IncomeTaxesPaidNet	$ 200.3us-gaap_IncomeTaxesPaidNet	$ 147.0us-gaap_IncomeTaxesPaidNet

X

- Definition

Future cash outflow to pay for purchases of fixed assets that have occurred.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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X

- Definition

The increase during the period in capital lease obligations due to entering into new capital leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586



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-Paragraph 3

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X

- Definition

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Section 50

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- Definition

The amount of cash paid for interest during the period.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

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-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586



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