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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