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Organization and Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 02, 2018 | Jan. 01, 2018
Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net | $ 929.1 |  |  |  | $ 954.9 |  |  |  | $ 929.1 | $ 954.9 |  | $ 977.3 |
Inventories | 4,040.1 |  |  |  | 3,944.1 |  |  |  | 4,040.1 | 3,944.1 |  | 3,930.7 |
Liabilities and Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued expenses | 566.6 |  |  |  | 523.5 |  |  |  | 566.6 | 523.5 |  | 523.6 |
Deferred tax liabilities | 577.8 |  |  |  | 481.5 |  |  |  | 577.8 | 481.5 |  | 483.8 |
Retained earnings | 2,365.8 |  |  |  | 2,009.4 |  |  |  | 2,365.8 | 2,009.4 |  | $ 2,016.0 |
Statement of Income |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | 5,439.3 | $ 5,658.6 | $ 5,940.3 | $ 5,746.9 | 5,398.0 | $ 5,524.4 | $ 5,383.4 | $ 5,081.1 | 22,785.1 | 21,386.9 | $ 20,118.5 |  |
Cost of sales |  |  |  |  |  |  |  |  | 19,370.2 | 18,164.4 | 17,151.9 |  |
Gross profit | 808.1 | 852.6 | 889.8 | 864.4 | 808.3 | 822.6 | 817.3 | 774.3 | 3,414.9 | 3,222.5 | 2,966.6 |  |
Income taxes |  |  |  |  |  |  |  |  | (134.3) | 64.8 | (160.7) |  |
Net income | 97.2 | $ 130.1 | $ 135.2 | $ 107.8 | $ 328.6 | $ 94.3 | $ 106.9 | $ 83.0 | 470.3 | 612.8 | 346.4 |  |
ASC 606 | Without Adoption of ASC 606 |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net | 899.9 |  |  |  |  |  |  |  | 899.9 |  |  |  |
Inventories | 4,057.2 |  |  |  |  |  |  |  | 4,057.2 |  |  |  |
Liabilities and Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued expenses | 566.2 |  |  |  |  |  |  |  | 566.2 |  |  |  |
Deferred tax liabilities | 574.8 |  |  |  |  |  |  |  | 574.8 |  |  |  |
Retained earnings | 2,357.1 |  |  |  |  |  |  |  | 2,357.1 |  |  |  |
Statement of Income |  |  |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | 3,412.1 |  |  |  |
Income taxes |  |  |  |  |  |  |  |  | (133.5) |  |  |  |
Net income |  |  |  |  |  |  |  |  | 468.3 |  |  |  |
ASC 606 | Adjustment Impact of Adoption of ASC 606 |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net | 29.2 |  |  |  |  |  |  |  | 29.2 |  |  |  | $ 22.4
Inventories | (17.1) |  |  |  |  |  |  |  | (17.1) |  |  |  | (13.4)
Liabilities and Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued expenses | 0.4 |  |  |  |  |  |  |  | 0.4 |  |  |  | 0.1
Deferred tax liabilities | 3.0 |  |  |  |  |  |  |  | 3.0 |  |  |  | 2.3
Retained earnings | $ 8.7 |  |  |  |  |  |  |  | 8.7 |  |  |  | $ 6.6
Statement of Income |  |  |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | 2.8 |  |  |  |
Income taxes |  |  |  |  |  |  |  |  | 0.8 |  |  |  |
Net income |  |  |  |  |  |  |  |  | 2.0 |  |  |  |
Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 20,849.2 | 19,824.3 | 18,673.2 |  |
Cost of sales |  |  |  |  |  |  |  |  | 17,790.6 | 16,899.5 | 15,968.4 |  |
Retail Automotive Dealership | Without Adoption of ASC 606 |  |  |  |  |  |  |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 19,824.3 | 18,673.2 |  |
Retail Automotive Dealership | ASC 606 | Without Adoption of ASC 606 |  |  |  |  |  |  |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 20,846.0 |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  | 17,788.5 |  |  |  |
Retail Automotive Dealership | ASC 606 | Adjustment Impact of Adoption of ASC 606 |  |  |  |  |  |  |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 3.2 |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  | 2.1 |  |  |  |
Retail Commercial Truck Dealership |  |  |  |  |  |  |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,374.5 | 1,048.0 | 1,000.7 |  |
Cost of sales |  |  |  |  |  |  |  |  | 1,163.0 | 882.2 | 857.8 |  |
Retail Commercial Truck Dealership | Without Adoption of ASC 606 |  |  |  |  |  |  |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 1,048.0 | 1,000.7 |  |
Retail Commercial Truck Dealership | ASC 606 | Without Adoption of ASC 606 |  |  |  |  |  |  |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,373.9 |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  | 1,162.7 |  |  |  |
Retail Commercial Truck Dealership | ASC 606 | Adjustment Impact of Adoption of ASC 606 |  |  |  |  |  |  |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0.6 |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  | 0.3 |  |  |  |
Commercial Vehicle Distribution and Other |  |  |  |  |  |  |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 561.4 | 514.6 | 444.6 |  |
Cost of sales |  |  |  |  |  |  |  |  | 416.6 | 382.7 | 325.7 |  |
Commercial Vehicle Distribution and Other | Without Adoption of ASC 606 |  |  |  |  |  |  |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 514.6 | $ 444.6 |  |
Commercial Vehicle Distribution and Other | ASC 606 | Without Adoption of ASC 606 |  |  |  |  |  |  |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 558.5 |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  | 415.1 |  |  |  |
Commercial Vehicle Distribution and Other | ASC 606 | Adjustment Impact of Adoption of ASC 606 |  |  |  |  |  |  |  |  |  |  |  |  |
Statement of Income |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2.9 |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  | $ 1.5 |  |  |  |

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