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Interim Financial Statements - Recent Accounting Pronouncements - ASU 2014-09 - Initial Application (Details) - USD ($) $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Jan. 02, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Assets |  |  |  |  |
Accounts receivable, net | $ 1,035.4 |  | $ 977.3 |  | $ 954.9
Inventories | 3,972.2 |  | 3,930.7 |  | 3,944.1
Liabilities and Equity |  |  |  |  |
Accrued expenses | 563.9 |  | 523.6 |  | 523.5
Deferred tax liabilities | 505.5 |  | 483.8 |  | 481.5
Retained earnings | 2,094.9 |  | $ 2,016.0 |  | $ 2,009.4
Statement of Income |  |  |  |  |
Gross profit | 864.4 | $ 774.3 |  |  |
Income taxes | (36.6) | (41.1) |  |  |
Net income | 107.8 | 83.0 |  |  |
ASC 606 | Without Adoption of ASC 606 |  |  |  |  |
Assets |  |  |  |  |
Accounts receivable, net | 1,010.1 |  |  |  |
Inventories | 3,987.9 |  |  |  |
Liabilities and Equity |  |  |  |  |
Accrued expenses | 563.8 |  |  |  |
Deferred tax liabilities | 503.0 |  |  |  |
Retained earnings | 2,087.9 |  |  |  |
Statement of Income |  |  |  |  |
Gross profit | 863.8 |  |  |  |
Income taxes | (36.4) |  |  |  |
Net income | 107.4 |  |  |  |
ASC 606 | Adjustment Impact of Adoption of ASC 606 |  |  |  |  |
Assets |  |  |  |  |
Accounts receivable, net | 25.3 |  |  | $ 22.4 |
Inventories | (15.7) |  |  | (13.4) |
Liabilities and Equity |  |  |  |  |
Accrued expenses | 0.1 |  |  | 0.1 |
Deferred tax liabilities | 2.5 |  |  | 2.3 |
Retained earnings | 7.0 |  |  | $ 6.6 |
Statement of Income |  |  |  |  |
Gross profit | 0.6 |  |  |  |
Income taxes | 0.2 |  |  |  |
Net income | 0.4 |  |  |  |
Retail Automotive Dealership |  |  |  |  |
Statement of Income |  |  |  |  |
Revenues | 5,296.0 |  |  |  |
Cost of sales | 4,517.7 |  |  |  |
Retail Automotive Dealership | Without Adoption of ASC 606 |  |  |  |  |
Statement of Income |  |  |  |  |
Revenues |  | 4,756.4 |  |  |
Retail Automotive Dealership | ASC 606 | Without Adoption of ASC 606 |  |  |  |  |
Statement of Income |  |  |  |  |
Revenues | 5,295.5 |  |  |  |
Cost of sales | 4,517.1 |  |  |  |
Retail Automotive Dealership | ASC 606 | Adjustment Impact of Adoption of ASC 606 |  |  |  |  |
Statement of Income |  |  |  |  |
Revenues | 0.5 |  |  |  |
Cost of sales | 0.6 |  |  |  |
Retail Commercial Truck Dealership |  |  |  |  |
Statement of Income |  |  |  |  |
Revenues | 292.4 |  |  |  |
Cost of sales | 245.8 |  |  |  |
Retail Commercial Truck Dealership | Without Adoption of ASC 606 |  |  |  |  |
Statement of Income |  |  |  |  |
Revenues |  | 211.7 |  |  |
Retail Commercial Truck Dealership | ASC 606 | Without Adoption of ASC 606 |  |  |  |  |
Statement of Income |  |  |  |  |
Revenues | 291.5 |  |  |  |
Cost of sales | 245.3 |  |  |  |
Retail Commercial Truck Dealership | ASC 606 | Adjustment Impact of Adoption of ASC 606 |  |  |  |  |
Statement of Income |  |  |  |  |
Revenues | 0.9 |  |  |  |
Cost of sales | 0.5 |  |  |  |
Commercial Vehicle Distribution and Other |  |  |  |  |
Statement of Income |  |  |  |  |
Revenues | 158.5 |  |  |  |
Cost of sales | 119.0 |  |  |  |
Commercial Vehicle Distribution and Other | Without Adoption of ASC 606 |  |  |  |  |
Statement of Income |  |  |  |  |
Revenues |  | $ 113.0 |  |  |
Commercial Vehicle Distribution and Other | ASC 606 | Without Adoption of ASC 606 |  |  |  |  |
Statement of Income |  |  |  |  |
Revenues | 157.0 |  |  |  |
Cost of sales | 117.8 |  |  |  |
Commercial Vehicle Distribution and Other | ASC 606 | Adjustment Impact of Adoption of ASC 606 |  |  |  |  |
Statement of Income |  |  |  |  |
Revenues | 1.5 |  |  |  |
Cost of sales | $ 1.2 |  |  |  |

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