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Floorplan Notes Payable - Schedule of Floorplan Notes Payable (Details) - Line of credit - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Revolving credit facility — floorplan notes payable |  |
Line of Credit Facility [Line Items] |  |
Long-term debt, gross | $ 840.4 | $ 1,206.0
Long-term debt, offset | (108.2) | (106.8)
Long-term debt | 732.2 | 1,099.1
Other non-manufacturer facilities |  |
Line of Credit Facility [Line Items] |  |
Long-term debt | 39.0 | 45.3
Floorplan notes payable — credit facility and other, net |  |
Line of Credit Facility [Line Items] |  |
Long-term debt | 771.3 | 1,144.4
FMCC facility |  |
Line of Credit Facility [Line Items] |  |
Long-term debt, gross | 133.2 | 208.5
Long-term debt, offset | (18.5) | (4.1)
Long-term debt | 114.7 | 204.5
Other manufacturer affiliate facilities |  |
Line of Credit Facility [Line Items] |  |
Long-term debt | 200.1 | 255.4
Floorplan notes payable — manufacturer affiliates, net |  |
Line of Credit Facility [Line Items] |  |
Long-term debt | $ 314.8 | $ 459.9

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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