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Interim Financial Statements - Recent Accounting Pronouncements - ASU 2014-09 - Initial Application (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 02, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Assets |  |  |  |  |  |  |
Accounts receivable, net | $ 953.4 |  | $ 953.4 |  | $ 977.3 |  | $ 954.9
Inventories | 3,783.4 |  | 3,783.4 |  | 3,930.7 |  | 3,944.1
Liabilities and Equity |  |  |  |  |  |  |
Accrued expenses | 570.2 |  | 570.2 |  | 523.6 |  | 523.5
Deferred tax liabilities | 547.9 |  | 547.9 |  | 483.8 |  | 481.5
Retained earnings | 2,299.2 |  | 2,299.2 |  | $ 2,016.0 |  | $ 2,009.4
Statement of Income |  |  |  |  |  |  |
Gross profit | 852.6 | $ 822.6 | 2,606.8 | $ 2,414.2 |  |  |
Income taxes | (27.1) | (44.7) | (104.7) | (136.0) |  |  |
Net income | 130.1 | 94.3 | 373.1 | 284.2 |  |  |
ASC 606 | Without Adoption of ASC 606 |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Accounts receivable, net | 925.7 |  | 925.7 |  |  |  |
Inventories | 3,799.2 |  | 3,799.2 |  |  |  |
Liabilities and Equity |  |  |  |  |  |  |
Accrued expenses | 569.8 |  | 569.8 |  |  |  |
Deferred tax liabilities | 544.9 |  | 544.9 |  |  |  |
Retained earnings | 2,290.7 |  | 2,290.7 |  |  |  |
Statement of Income |  |  |  |  |  |  |
Gross profit | 853.0 |  | 2,604.2 |  |  |  |
Income taxes | (27.2) |  | (103.9) |  |  |  |
Net income | 130.4 |  | 371.3 |  |  |  |
ASC 606 | Adjustment Impact of Adoption of ASC 606 |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Accounts receivable, net | 27.7 |  | 27.7 |  |  | $ 22.4 |
Inventories | (15.8) |  | (15.8) |  |  | (13.4) |
Liabilities and Equity |  |  |  |  |  |  |
Accrued expenses | 0.4 |  | 0.4 |  |  | 0.1 |
Deferred tax liabilities | 3.0 |  | 3.0 |  |  | 2.3 |
Retained earnings | 8.5 |  | 8.5 |  |  | $ 6.6 |
Statement of Income |  |  |  |  |  |  |
Gross profit | (0.4) |  | 2.6 |  |  |  |
Income taxes | (0.1) |  | 0.8 |  |  |  |
Net income | (0.3) |  | 1.8 |  |  |  |
Retail Automotive Dealership |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |
Revenues | 5,148.5 |  | 15,900.0 |  |  |  |
Cost of sales | 4,386.3 |  | 13,561.5 |  |  |  |
Retail Automotive Dealership | Without Adoption of ASC 606 |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |
Revenues |  | 5,085.4 |  | 14,882.5 |  |  |
Retail Automotive Dealership | ASC 606 | Without Adoption of ASC 606 |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |
Revenues | 5,149.4 |  | 15,898.2 |  |  |  |
Cost of sales | 4,387.0 |  | 13,560.4 |  |  |  |
Retail Automotive Dealership | ASC 606 | Adjustment Impact of Adoption of ASC 606 |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |
Revenues | (0.9) |  | 1.8 |  |  |  |
Cost of sales | (0.7) |  | 1.1 |  |  |  |
Retail Commercial Truck Dealership |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |
Revenues | 385.3 |  | 1,016.5 |  |  |  |
Cost of sales | 327.5 |  | 859.7 |  |  |  |
Retail Commercial Truck Dealership | Without Adoption of ASC 606 |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |
Revenues |  | 299.6 |  | 739.8 |  |  |
Retail Commercial Truck Dealership | ASC 606 | Without Adoption of ASC 606 |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |
Revenues | 384.3 |  | 1,015.4 |  |  |  |
Cost of sales | 327.0 |  | 859.1 |  |  |  |
Retail Commercial Truck Dealership | ASC 606 | Adjustment Impact of Adoption of ASC 606 |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |
Revenues | 1.0 |  | 1.1 |  |  |  |
Cost of sales | 0.5 |  | 0.6 |  |  |  |
Commercial Vehicle Distribution and Other |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |
Revenues | 124.8 |  | 429.3 |  |  |  |
Cost of sales | 92.2 |  | 317.8 |  |  |  |
Commercial Vehicle Distribution and Other | Without Adoption of ASC 606 |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |
Revenues |  | $ 139.4 |  | $ 366.6 |  |  |
Commercial Vehicle Distribution and Other | ASC 606 | Without Adoption of ASC 606 |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |
Revenues | 126.2 |  | 426.9 |  |  |  |
Cost of sales | 92.9 |  | 316.8 |  |  |  |
Commercial Vehicle Distribution and Other | ASC 606 | Adjustment Impact of Adoption of ASC 606 |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |
Revenues | (1.4) |  | 2.4 |  |  |  |
Cost of sales | $ (0.7) |  | $ 1.0 |  |  |  |

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