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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