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Stock-Based Compensation Plans (Schedule Of Future Share-Based Compensation Cost) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
2015 | $ 10.1 cacc_EmployeeServiceShareBasedCompensationEstimatedAllocationOfRecognizedPeriodCostsNextTwelveMonths
2016 | 6.4 cacc_EmployeeServiceShareBasedCompensationEstimatedAllocationOfRecognizedPeriodCostsInTwoYears
2017 | 4.2 cacc_EmployeeServiceShareBasedCompensationEstimatedAllocationOfRecognizedPeriodCostsInThreeYears
2018 | 3.5 cacc_EmployeeServiceShareBasedCompensationEstimatedAllocationOfRecognizedPeriodCostsInFourYears
2019 | 2.6 cacc_EmployeeServiceShareBasedCompensationEstimatedAllocationOfRecognizedPeriodCostsInFiveYears
Thereafter | 5.9 cacc_EmployeeServiceShareBasedCompensationEstimatedAllocationOfRecognizedPeriodCostsAfterFiveYears
Total | 32.7 cacc_EmployeeServiceShareBasedCompensationEstimatedAllocationOfRecognizedPeriodCostsTotal
Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
2015 | 2.5 cacc_EmployeeServiceShareBasedCompensationEstimatedAllocationOfRecognizedPeriodCostsNextTwelveMonths / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
2016 | 1.9 cacc_EmployeeServiceShareBasedCompensationEstimatedAllocationOfRecognizedPeriodCostsInTwoYears / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
2017 | 1.6 cacc_EmployeeServiceShareBasedCompensationEstimatedAllocationOfRecognizedPeriodCostsInThreeYears / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
2018 | 1.4 cacc_EmployeeServiceShareBasedCompensationEstimatedAllocationOfRecognizedPeriodCostsInFourYears / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
2019 | 1.2 cacc_EmployeeServiceShareBasedCompensationEstimatedAllocationOfRecognizedPeriodCostsInFiveYears / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Thereafter | 4.6 cacc_EmployeeServiceShareBasedCompensationEstimatedAllocationOfRecognizedPeriodCostsAfterFiveYears / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Total | 13.2 cacc_EmployeeServiceShareBasedCompensationEstimatedAllocationOfRecognizedPeriodCostsTotal / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Restricted Stock Units (RSUs) [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
2015 | 7.6 cacc_EmployeeServiceShareBasedCompensationEstimatedAllocationOfRecognizedPeriodCostsNextTwelveMonths / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
2016 | 4.5 cacc_EmployeeServiceShareBasedCompensationEstimatedAllocationOfRecognizedPeriodCostsInTwoYears / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
2017 | 2.6 cacc_EmployeeServiceShareBasedCompensationEstimatedAllocationOfRecognizedPeriodCostsInThreeYears / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
2018 | 2.1 cacc_EmployeeServiceShareBasedCompensationEstimatedAllocationOfRecognizedPeriodCostsInFourYears / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
2019 | 1.4 cacc_EmployeeServiceShareBasedCompensationEstimatedAllocationOfRecognizedPeriodCostsInFiveYears / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Thereafter | 1.3 cacc_EmployeeServiceShareBasedCompensationEstimatedAllocationOfRecognizedPeriodCostsAfterFiveYears / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Total | $ 19.5 cacc_EmployeeServiceShareBasedCompensationEstimatedAllocationOfRecognizedPeriodCostsTotal / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember

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