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Long-Term Debt and Commercial Paper (Leverage Ratio And Capitalization Ratio Under The Terms Of The Amended Credit Agreement) (Details) - Credit Facility Due 2019 [Member]	Mar. 31, 2016
Debt Instrument [Line Items]
Leverage ratio, requirement	3.75
Leverage ratio, actual	2.60
Capitalization ratio, requirement	70.00%
Capitalization ratio, actual	64.90%

X

- Definition

The actual debt covenant capitalization ratio as defined in the credit agreement as principally reflecting vehicle floorplan payable and non-vehicle debt divided by the company's total capitalization including vehicle floorplan payable and certain adjustments. Under the credit agreement, the company is required to remain in compliance with a maximum capitalization ratio.

+ References

No definition available.

+ Details

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X

- Definition

The actual debt covenant leverage ratio as defined in the credit agreement as principally reflecting non-vehicle debt divided by a contractually defined measure of earnings with certain adjustments. Under the credit agreement, the company is required to remain in compliance with a maximum leverage ratio.

+ References

No definition available.

+ Details

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X

- Definition

The maximum capitalization ratio required under the company's credit agreement, which is a contractually defined amount principally reflecting vehicle floorplan payable and non-vehicle debt divided by the company's total capitalization including vehicle floorplan payable and certain adjustments.

+ References

No definition available.

+ Details

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X

- Definition

The maximum leverage ratio required under the company's credit agreement, which is a contractually defined amount principally reflecting non-vehicle debt divided by a contractually defined measure of earnings with certain adjustments.

+ References

No definition available.

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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