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Interim Financial Statements (Recent Accounting Pronouncements) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative effect to increase retained earnings (after-tax), revenue recognition standard |  |  | $ 10.1 |  |
Consolidated Balance Sheet |  |  |  |  |
Receivables, net | $ 854.5 |  | 854.5 |  | $ 1,111.0
Inventory | 3,587.0 |  | 3,587.0 |  | 3,365.6
Other current assets | 209.3 |  | 209.3 |  | 251.7
Other assets | 474.2 |  | 474.2 |  | 409.5
Other current liabilities | 659.4 |  | 659.4 |  | 774.5
Deferred income taxes | 76.8 |  | 76.8 |  | 71.9
Other liabilities | 276.7 |  | 276.7 |  | 235.4
Retained earnings | 3,033.6 |  | 3,033.6 |  | $ 2,832.2
Consolidated Statement of Income |  |  |  |  |
Revenues | 5,392.0 | $ 5,279.3 | 10,651.9 | $ 10,418.7 |
Cost of sales | 4,540.2 | 4,453.2 | 8,957.8 | 8,772.8 |
Gross profit | 851.8 | 826.1 | 1,694.1 | 1,645.9 |
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES | 129.6 | 144.9 | 255.8 | 304.7 |
Income tax provision | 32.2 | 57.2 | 65.1 | 118.8 |
NET INCOME FROM CONTINUING OPERATIONS | 97.4 | 87.7 | 190.7 | 185.9 |
NET INCOME | 97.6 | 87.7 | 191.3 | 185.8 |
Consolidated Statement of Cash Flows |  |  |  |  |
Net income | 97.6 | 87.7 | 191.3 | 185.8 |
Deferred income tax provision |  |  | 1.7 | 8.1 |
(Increase) decrease, net of effects from business combinations and divestitures |  |  |  |  |
Receivables |  |  | 257.1 | 233.2 |
Inventory |  |  | (248.7) | (198.6) |
Other assets |  |  | (99.2) | (27.6) |
Increase (decrease), net of effects from business combinations and divestitures |  |  |  |  |
Other liabilities |  |  | (11.9) | 15.7 |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative effect to increase retained earnings (after-tax), revenue recognition standard |  |  | 10.1 |  |
Accounting Standards Update 2016-02 [Member] | Minimum [Member] |  |  |  |  |
Increase (decrease), net of effects from business combinations and divestitures |  |  |  |  |
Expected additional operating lease liabilities | 375.0 |  | 375.0 |  |
Accounting Standards Update 2016-02 [Member] | Maximum [Member] |  |  |  |  |
Increase (decrease), net of effects from business combinations and divestitures |  |  |  |  |
Expected additional operating lease liabilities | 475.0 |  | 475.0 |  |
Parts and Service [Member] |  |  |  |  |
Consolidated Statement of Income |  |  |  |  |
Revenues | 857.1 | 857.5 | 1,715.6 | 1,702.6 |
Cost of sales | 469.8 | 479.9 | 942.8 | 954.0 |
Gross profit | 387.3 | 377.6 | 772.8 | 748.6 |
Finance and Insurance, Net [Member] |  |  |  |  |
Consolidated Statement of Income |  |  |  |  |
Revenues | 247.8 | 228.8 | 488.6 | 450.4 |
Gross profit | 247.8 | $ 228.8 | 488.6 | $ 450.4 |
Balances without adoption of ASC Topic 606 [Member] |  |  |  |  |
Consolidated Balance Sheet |  |  |  |  |
Receivables, net | 867.3 |  | 867.3 |  |
Inventory | 3,591.3 |  | 3,591.3 |  |
Other current assets | 156.0 |  | 156.0 |  |
Other assets | 417.7 |  | 417.7 |  |
Other current liabilities | 628.8 |  | 628.8 |  |
Deferred income taxes | 73.1 |  | 73.1 |  |
Other liabilities | 229.9 |  | 229.9 |  |
Retained earnings | 3,022.0 |  | 3,022.0 |  |
Consolidated Statement of Income |  |  |  |  |
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES | 128.3 |  | 253.8 |  |
Income tax provision | 31.9 |  | 64.6 |  |
NET INCOME FROM CONTINUING OPERATIONS | 96.4 |  | 189.2 |  |
NET INCOME | 96.6 |  | 189.8 |  |
Consolidated Statement of Cash Flows |  |  |  |  |
Net income | 96.6 |  | 189.8 |  |
Deferred income tax provision |  |  | 1.2 |  |
(Increase) decrease, net of effects from business combinations and divestitures |  |  |  |  |
Receivables |  |  | 244.3 |  |
Inventory |  |  | (248.3) |  |
Other assets |  |  | (7.4) |  |
Increase (decrease), net of effects from business combinations and divestitures |  |  |  |  |
Other liabilities |  |  | (89.3) |  |
Balances without adoption of ASC Topic 606 [Member] | Parts and Service [Member] |  |  |  |  |
Consolidated Statement of Income |  |  |  |  |
Revenues | 857.1 |  | 1,716.6 |  |
Cost of sales | 469.8 |  | 943.4 |  |
Gross profit | 387.3 |  | 773.2 |  |
Balances without adoption of ASC Topic 606 [Member] | Finance and Insurance, Net [Member] |  |  |  |  |
Consolidated Statement of Income |  |  |  |  |
Revenues | 246.5 |  | 486.2 |  |
Gross profit | 246.5 |  | 486.2 |  |
Impact of adoption Higher/(Lower) [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |
Consolidated Balance Sheet |  |  |  |  |
Receivables, net | (12.8) |  | (12.8) |  |
Inventory | (4.3) |  | (4.3) |  |
Other current assets | 53.3 |  | 53.3 |  |
Other assets | 56.5 |  | 56.5 |  |
Other current liabilities | 30.6 |  | 30.6 |  |
Deferred income taxes | 3.7 |  | 3.7 |  |
Other liabilities | 46.8 |  | 46.8 |  |
Retained earnings | 11.6 |  | 11.6 |  |
Consolidated Statement of Income |  |  |  |  |
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES | 1.3 |  | 2.0 |  |
Income tax provision | 0.3 |  | 0.5 |  |
NET INCOME FROM CONTINUING OPERATIONS | 1.0 |  | 1.5 |  |
NET INCOME | 1.0 |  | 1.5 |  |
Consolidated Statement of Cash Flows |  |  |  |  |
Net income | 1.0 |  | 1.5 |  |
Deferred income tax provision |  |  | 0.5 |  |
(Increase) decrease, net of effects from business combinations and divestitures |  |  |  |  |
Receivables |  |  | 12.8 |  |
Inventory |  |  | (0.4) |  |
Other assets |  |  | (91.8) |  |
Increase (decrease), net of effects from business combinations and divestitures |  |  |  |  |
Other liabilities |  |  | 77.4 |  |
Impact of adoption Higher/(Lower) [Member] | Parts and Service [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |
Consolidated Statement of Income |  |  |  |  |
Revenues | 0.0 |  | (1.0) |  |
Cost of sales | 0.0 |  | (0.6) |  |
Gross profit | 0.0 |  | (0.4) |  |
Impact of adoption Higher/(Lower) [Member] | Finance and Insurance, Net [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |
Consolidated Statement of Income |  |  |  |  |
Revenues | 1.3 |  | 2.4 |  |
Gross profit | $ 1.3 |  | $ 2.4 |  |

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