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Interim Financial Statements (Recent Accounting Pronouncements) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 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 | 883.1 |  | $ 1,111.0
Inventory | 3,529.3 |  | 3,365.6
Other current assets | 177.0 |  | 251.7
Other assets | 472.2 |  | 409.5
Other current liabilities | 707.4 |  | 774.5
Deferred income taxes | 76.1 |  | 71.9
Other liabilities | 280.0 |  | 235.4
Retained earnings | 2,936.0 |  | $ 2,832.2
Consolidated Statement of Income |  |  |
Revenues | 5,259.9 | $ 5,139.4 |
Cost of sales | 4,417.6 | 4,319.6 |
Gross profit | 842.3 | 819.8 |
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES | 126.2 | 159.8 |
Income tax provision | 32.9 | 61.6 |
NET INCOME FROM CONTINUING OPERATIONS | 93.3 | 98.2 |
NET INCOME | 93.7 | 98.1 |
Consolidated Statement of Cash Flows |  |  |
Net income | 93.7 | 98.1 |
Deferred income tax provision | 1.0 | 4.2 |
(Increase) decrease, net of effects from business combinations and divestitures |  |  |
Receivables | 214.6 | 201.6 |
Inventory | (177.7) | (185.8) |
Other assets | (74.2) | (16.0) |
Increase (decrease), net of effects from business combinations and divestitures |  |  |
Other liabilities | 33.6 | 58.9 |
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 |  |
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 |  |
Parts and Service [Member] |  |  |
Consolidated Statement of Income |  |  |
Revenues | 858.5 | 845.1 |
Cost of sales | 473.0 | 474.1 |
Gross profit | 385.5 | 371.0 |
Finance and Insurance, Net [Member] |  |  |
Consolidated Statement of Income |  |  |
Revenues | 240.8 | 221.6 |
Gross profit | 240.8 | $ 221.6 |
Balances without adoption of ASC Topic 606 |  |  |
Consolidated Balance Sheet |  |  |
Receivables, net | 890.2 |  |
Inventory | 3,533.5 |  |
Other current assets | 127.4 |  |
Other assets | 419.4 |  |
Other current liabilities | 677.2 |  |
Deferred income taxes | 72.7 |  |
Other liabilities | 233.1 |  |
Retained earnings | 2,925.4 |  |
Consolidated Statement of Income |  |  |
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES | 125.5 |  |
Income tax provision | 32.7 |  |
NET INCOME FROM CONTINUING OPERATIONS | 92.8 |  |
NET INCOME | 93.2 |  |
Consolidated Statement of Cash Flows |  |  |
Net income | 93.2 |  |
Deferred income tax provision | 0.8 |  |
(Increase) decrease, net of effects from business combinations and divestitures |  |  |
Receivables | 207.5 |  |
Inventory | (177.2) |  |
Other assets | 10.2 |  |
Increase (decrease), net of effects from business combinations and divestitures |  |  |
Other liabilities | (43.5) |  |
Balances without adoption of ASC Topic 606 | Parts and Service [Member] |  |  |
Consolidated Statement of Income |  |  |
Revenues | 859.5 |  |
Cost of sales | 473.6 |  |
Gross profit | 385.9 |  |
Balances without adoption of ASC Topic 606 | Finance and Insurance, Net [Member] |  |  |
Consolidated Statement of Income |  |  |
Revenues | 239.7 |  |
Gross profit | 239.7 |  |
Impact of adoption Higher/(Lower) | Accounting Standards Update 2014-09 [Member] |  |  |
Consolidated Balance Sheet |  |  |
Receivables, net | (7.1) |  |
Inventory | (4.2) |  |
Other current assets | 49.6 |  |
Other assets | 52.8 |  |
Other current liabilities | 30.2 |  |
Deferred income taxes | 3.4 |  |
Other liabilities | 46.9 |  |
Retained earnings | 10.6 |  |
Consolidated Statement of Income |  |  |
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES | 0.7 |  |
Income tax provision | 0.2 |  |
NET INCOME FROM CONTINUING OPERATIONS | 0.5 |  |
NET INCOME | 0.5 |  |
Consolidated Statement of Cash Flows |  |  |
Net income | 0.5 |  |
Deferred income tax provision | 0.2 |  |
(Increase) decrease, net of effects from business combinations and divestitures |  |  |
Receivables | 7.1 |  |
Inventory | (0.5) |  |
Other assets | (84.4) |  |
Increase (decrease), net of effects from business combinations and divestitures |  |  |
Other liabilities | 77.1 |  |
Impact of adoption Higher/(Lower) | Parts and Service [Member] | Accounting Standards Update 2014-09 [Member] |  |  |
Consolidated Statement of Income |  |  |
Revenues | (1.0) |  |
Cost of sales | (0.6) |  |
Gross profit | (0.4) |  |
Impact of adoption Higher/(Lower) | Finance and Insurance, Net [Member] | Accounting Standards Update 2014-09 [Member] |  |  |
Consolidated Statement of Income |  |  |
Revenues | 1.1 |  |
Gross profit | $ 1.1 |  |

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