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Interim Financial Statements - Recent Accounting Pronouncements - ASU 2014-09 - Initial Application (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jan. 02, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Assets |  |  |  |  |  |  |
Accounts receivable, net | $ 919.6 |  | $ 919.6 |  | $ 977.3 |  | $ 954.9
Inventories | 3,895.1 |  | 3,895.1 |  | 3,930.7 |  | 3,944.1
Liabilities and Equity |  |  |  |  |  |  |
Accrued expenses | 529.7 |  | 529.7 |  | 523.6 |  | 523.5
Deferred tax liabilities | 530.8 |  | 530.8 |  | 483.8 |  | 481.5
Retained earnings | 2,199.7 |  | 2,199.7 |  | $ 2,016.0 |  | $ 2,009.4
Statement of Income |  |  |  |  |  |  |
Gross profit | 889.8 | $ 817.3 | 1,754.2 | $ 1,591.6 |  |  |
Income taxes | (41.0) | (50.2) | (77.6) | (91.3) |  |  |
Net income | 135.2 | 106.9 | 243.0 | 189.9 |  |  |
ASC 606 | Without Adoption of ASC 606 |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Accounts receivable, net | 890.6 |  | 890.6 |  |  |  |
Inventories | 3,912.0 |  | 3,912.0 |  |  |  |
Liabilities and Equity |  |  |  |  |  |  |
Accrued expenses | 529.5 |  | 529.5 |  |  |  |
Deferred tax liabilities | 527.7 |  | 527.7 |  |  |  |
Retained earnings | 2,190.9 |  | 2,190.9 |  |  |  |
Statement of Income |  |  |  |  |  |  |
Gross profit | 887.4 |  | 1,751.2 |  |  |  |
Income taxes | (40.3) |  | (76.7) |  |  |  |
Net income | 133.5 |  | 240.9 |  |  |  |
ASC 606 | Adjustment Impact of Adoption of ASC 606 |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Accounts receivable, net | 29.0 |  | 29.0 |  |  | $ 22.4 |
Inventories | (16.9) |  | (16.9) |  |  | (13.4) |
Liabilities and Equity |  |  |  |  |  |  |
Accrued expenses | 0.2 |  | 0.2 |  |  | 0.1 |
Deferred tax liabilities | 3.1 |  | 3.1 |  |  | 2.3 |
Retained earnings | 8.8 |  | 8.8 |  |  | $ 6.6 |
Statement of Income |  |  |  |  |  |  |
Gross profit | 2.4 |  | 3.0 |  |  |  |
Income taxes | 0.7 |  | 0.9 |  |  |  |
Net income | 1.7 |  | 2.1 |  |  |  |
Retail Automotive Dealership |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |
Revenues | 5,455.5 |  | 10,751.5 |  |  |  |
Cost of sales | 4,657.5 |  | 9,175.2 |  |  |  |
Retail Automotive Dealership | Without Adoption of ASC 606 |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |
Revenues |  | 5,040.7 |  | 9,797.1 |  |  |
Retail Automotive Dealership | ASC 606 | Without Adoption of ASC 606 |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |
Revenues | 5,453.3 |  | 10,748.8 |  |  |  |
Cost of sales | 4,656.3 |  | 9,173.4 |  |  |  |
Retail Automotive Dealership | ASC 606 | Adjustment Impact of Adoption of ASC 606 |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |
Revenues | 2.2 |  | 2.7 |  |  |  |
Cost of sales | 1.2 |  | 1.8 |  |  |  |
Retail Commercial Truck Dealership |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |
Revenues | 338.8 |  | 631.2 |  |  |  |
Cost of sales | 286.4 |  | 532.2 |  |  |  |
Retail Commercial Truck Dealership | Without Adoption of ASC 606 |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |
Revenues |  | 228.5 |  | 440.2 |  |  |
Retail Commercial Truck Dealership | ASC 606 | Without Adoption of ASC 606 |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |
Revenues | 339.6 |  | 631.1 |  |  |  |
Cost of sales | 286.8 |  | 532.1 |  |  |  |
Retail Commercial Truck Dealership | ASC 606 | Adjustment Impact of Adoption of ASC 606 |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |
Revenues | (0.8) |  | 0.1 |  |  |  |
Cost of sales | (0.4) |  | 0.1 |  |  |  |
Commercial Vehicle Distribution and Other |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |
Revenues | 146.0 |  | 304.5 |  |  |  |
Cost of sales | 106.6 |  | 225.6 |  |  |  |
Commercial Vehicle Distribution and Other | Without Adoption of ASC 606 |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |
Revenues |  | $ 114.2 |  | $ 227.2 |  |  |
Commercial Vehicle Distribution and Other | ASC 606 | Without Adoption of ASC 606 |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |
Revenues | 143.7 |  | 300.7 |  |  |  |
Cost of sales | 106.1 |  | 223.9 |  |  |  |
Commercial Vehicle Distribution and Other | ASC 606 | Adjustment Impact of Adoption of ASC 606 |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |
Revenues | 2.3 |  | 3.8 |  |  |  |
Cost of sales | $ 0.5 |  | $ 1.7 |  |  |  |

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