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Acquisitions (Purchase Price Allocation) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Business Combination Segment Allocation [Line Items] |  |  |
Supplemental pro forma revenue | $ 21,945.6 | $ 22,169.9 |
Supplemental pro forma net income from continuing operations | 434.1 | 469.4 |
Receivables, net | 19.9 |  |
Inventory | 272.4 |  |
Property and equipment | 130.4 |  |
Goodwill | 140.4 |  |
Franchise rights - indefinite-lived | 169.2 |  |
Other assets | 9.4 |  |
Accounts payable | (9.0) |  |
Vehicle floorplan payable - non-trade | (264.4) |  |
Deferred income taxes | (7.5) |  |
Other liabilities | (13.0) |  |
Aggregate purchase price | 447.8 |  |
Capital leases and other obligations | (37.4) |  |
Cash used in business acquisitions, net of cash acquired | 410.4 | $ 321.5 | $ 205.2
Reporting Unit, Domestic [Member] |  |  |
Business Combination Segment Allocation [Line Items] |  |  |
Goodwill | 57.9 |  |
Reporting Unit, Import [Member] |  |  |
Business Combination Segment Allocation [Line Items] |  |  |
Goodwill | 2.0 |  |
Reporting Unit, Premium Luxury [Member] |  |  |
Business Combination Segment Allocation [Line Items] |  |  |
Goodwill | 76.9 |  |
Goodwill Corporate and Other [Member] |  |  |
Business Combination Segment Allocation [Line Items] |  |  |
Goodwill | $ 3.6 |  |

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- Definition Amount of deferred tax liability attributable to taxable temporary difference assumed at the acquisition date that are classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=73531372&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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