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Equity Method Investees (Details) - USD ($) $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 27, 2016 | Jul. 26, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jan. 31, 2016 | Aug. 31, 2015
Equity Method Investment |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 893.4 | $ 336.4 |  |  |
Equity in earnings of affiliates |  |  |  |  |  | 69.5 | 39.3 | $ 40.8 |  |
Condensed income statement information |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  | 7,397.2 | 6,770.3 | 6,620.1 |  |
Gross profit |  |  |  |  |  | 1,670.4 | 2,396.8 | 2,181.4 |  |
Net income |  |  |  |  |  | 411.5 | 398.5 | $ 357.2 |  |
Condensed balance sheet information |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  |  | 1,188.2 | 1,069.0 |  |  |
Noncurrent assets |  |  |  |  |  | 10,529.9 | 10,197.3 |  |  |
Total assets |  |  |  |  |  | 11,718.1 | 11,266.3 |  |  |
Current liabilities |  |  |  |  |  | 1,794.7 | 851.9 |  |  |
Noncurrent liabilities |  |  |  |  |  | 7,393.6 | 8,105.5 |  |  |
Equity |  |  |  |  |  | 2,529.8 | 2,308.9 |  |  |
Total liabilities and equity |  |  |  |  |  | $ 11,718.1 | 11,266.3 |  |  |
The Nix Group |  |  |  |  |  |  |  |  |  |
Equity Method Investment |  |  |  |  |  |  |  |  |  |
Ownership percentage of equity method investment |  |  |  |  |  | 50.00% |  |  |  |
Ibericar Keldinich SL |  |  |  |  |  |  |  |  |  |
Equity Method Investment |  |  |  |  |  |  |  |  |  |
Ownership percentage of equity method investment |  |  |  |  |  | 50.00% |  |  |  |
Nicole Group |  |  |  |  |  |  |  |  |  |
Equity Method Investment |  |  |  |  |  |  |  |  |  |
Ownership percentage of equity method investment |  |  |  |  |  | 49.00% |  |  | 49.00% |
Penske Commercial Leasing Australia |  |  |  |  |  |  |  |  |  |
Equity Method Investment |  |  |  |  |  |  |  |  |  |
Ownership percentage of equity method investment |  |  |  |  |  | 33.00% |  |  |  |
Ownership interest sold (as a percent) |  |  | 12.00% |  |  |  |  |  |  |
Penske Vehicle Services |  |  |  |  |  |  |  |  |  |
Equity Method Investment |  |  |  |  |  |  |  |  |  |
Ownership percentage of equity method investment |  |  |  |  |  | 31.00% |  |  |  |
National Powersport Auctions |  |  |  |  |  |  |  |  |  |
Equity Method Investment |  |  |  |  |  |  |  |  |  |
Ownership percentage of equity method investment |  |  |  |  |  | 7.00% |  |  |  |
Max Cycles |  |  |  |  |  |  |  |  |  |
Equity Method Investment |  |  |  |  |  |  |  |  |  |
Ownership interest sold (as a percent) |  |  |  | 50.00% |  |  |  |  |  |
PTL |  |  |  |  |  |  |  |  |  |
Equity Method Investment |  |  |  |  |  |  |  |  |  |
Ownership percentage of equity method investment |  |  |  |  |  | 23.40% |  |  |  |
Ownership acquired (as a percent) | 14.40% |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 823.8 | 290.6 |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) |  | 9.00% |  |  |  | 23.40% |  |  |  |
Nix Group, Ibericar Keldinich SL, the Nicole Group, Penske Commercial Leasing Australia, Penske Vehicle Services and National Powersport Auctions |  |  |  |  |  |  |  |  |  |
Equity Method Investment |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 69.6 |  |  |  |
Nix Group, Ibericar Keldinich SL, Penske Commercial Leasing Australia, Penske Vehicle Services and National Powersport Auctions |  |  |  |  |  |  |  |  |  |
Equity Method Investment |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  | $ 45.8 |  |  |
German Automotive Dealership Group |  |  |  |  |  |  |  |  |  |
Equity Method Investment |  |  |  |  |  |  |  |  |  |
Ownership acquired (as a percent) |  |  |  |  | 8.00% |  | 10.00% |  |  |
Ownership interest (as a percent) |  |  |  | 60.00% |  | 68.00% |  |  |  | 50.00%
German Automotive Dealership Group |  |  |  |  |  |  |  |  |  |
Equity Method Investment |  |  |  |  |  |  |  |  |  |
Ownership acquired (as a percent) |  |  |  | 10.00% | 8.00% |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  | 68.00% |  | 60.00% |  |  |

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- Definition Amount of equity, including noncontrolling interest, reported by an equity method investment of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.g) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721683-107760 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 + Details
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- Definition The amount of gross profit (loss) reported by an equity method investment of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721683-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33912-111571 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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- Definition The amount of liabilities and equity reported by an equity method investment of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33912-111571 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721683-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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