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Summary Of Significant Accounting Policies (Schedule Of Other Income) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Summary Of Significant Accounting Policies [Line Items] |  |  |
Other Income | $ 51.9 | $ 46.6 | $ 40.8
Ancillary Product Profit Sharing [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Other Income | 15.5 | 11.9 | 11.1
GPS-SID Fees [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Other Income | 13.5 | 16.4 | 12.8
Remarketing Fees [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Other Income | 9.2 | 6.9 | 6.2
Dealer Enrollment Fees [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Other Income | 5.0 | 4.8 | 4.6
Dealer Support Products And Services [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Other Income | 4.7 | 4.9 | 4.6
Other [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Other Income | $ 4.0 | $ 1.7 | $ 1.5

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- Definition Reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.4) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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