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Summary of Accounting Policies Summary of Accounting Policies - Effects of Adopting ASC 606 (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
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Revenues $ 1,077.3 $ 1,181.4 $ 1,236.1 $ 984.7 $ 990.5 $ 1,002.4 $ 983.9 $ 774.0 $ 4,479.5 $ 3,750.8 $ 3,425.2
Cost of goods sold                 3,304.8 2,702.5 2,338.8
Operating income 114.6 140.0 159.7 94.7 93.4 134.8 146.3 89.5 509.0 464.0 404.2
Provision for income taxes                 87.3 88.4 148.1
Income from continuing operations 89.1 $ 96.9 $ 114.7 $ 57.9 108.9 $ 79.1 $ 94.7 $ 57.9 358.6 340.6 231.1
Net income                 611.1 365.5 $ 250.1
Receivables 698.3       625.7       698.3 625.7  
Inventories, net 457.5       448.8       457.5 448.8  
Other current assets 75.3       73.6       75.3 73.6  
Accrued expenses 258.0       257.8       258.0 257.8  
Other long-term liabilities 266.5       288.7       266.5 288.7  
Retained earnings 3,351.4       $ 2,820.8       3,351.4 $ 2,820.8  
Balances Without Adoption of ASC 606                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Revenues                 4,457.6    
Cost of goods sold                 3,290.1    
Operating income                 501.8    
Provision for income taxes                 85.5    
Income from continuing operations                 353.2    
Net income                 605.7    
Receivables 654.0               654.0    
Inventories, net 487.0               487.0    
Other current assets 74.4               74.4    
Accrued expenses 256.2               256.2    
Other long-term liabilities 264.5               264.5    
Retained earnings 3,344.9               3,344.9    
Accounting Standards Update 2014-09 | Effect of Change Higher/(Lower)                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Revenues                 21.9    
Cost of goods sold                 14.7    
Operating income                 7.2    
Provision for income taxes                 1.8    
Income from continuing operations                 5.4    
Net income                 5.4    
Receivables 44.3               44.3    
Inventories, net (29.5)               (29.5)    
Other current assets 0.9               0.9    
Accrued expenses 1.8               1.8    
Other long-term liabilities 2.0               2.0    
Retained earnings $ 6.5               $ 6.5