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Loans Receivable (Summary of Changes In Allowance for Credit Losses) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Balance, beginning of period |  | $ 276.9 | $ 217.9 | $ 243.6 | $ 206.9
Provision for credit losses |  | 22.8 | 13.2 | 62.8 | 27.8
Write-offs |  | (3.3) | (1.3) | (10.7) | (5.9)
Recoveries | [1],[2] | 0.4 | 0.4 | 1.1 | 1.4
Balance, end of period |  | 296.8 | 230.2 | 296.8 | 230.2
Dealer Loans [Member] |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Balance, beginning of period |  | 268.2 | 209.4 | 235.1 | 198.1
Provision for credit losses |  | 21.6 | 13.4 | 61.3 | 28.2
Write-offs |  | (3.1) | (1.3) | (10.4) | (5.7)
Recoveries | [1],[2] | 0.3 | 0.3 | 1.0 | 1.2
Balance, end of period |  | 287.0 | 221.8 | 287.0 | 221.8
Purchased Loans [Member] |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Balance, beginning of period |  | 8.7 | 8.5 | 8.5 | 8.8
Provision for credit losses |  | 1.2 | (0.2) | 1.5 | (0.4)
Write-offs |  | (0.2) | 0.0 | (0.3) | (0.2)
Recoveries | [1],[2] | 0.1 | 0.1 | 0.1 | 0.2
Balance, end of period |  | $ 9.8 | $ 8.4 | $ 9.8 | $ 8.4
[1] | Represents collections received on previously written off Loans.
[2] | Represents collections received on previously written off Loans.

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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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