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New Accounting Pronouncements - Narrative (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Item Effected [Line Items]          
Total net sales $ 1,649.5 $ 1,734.9 $ 5,036.8 $ 5,013.8  
Total gross profit 315.4 323.5 900.7 952.3  
Inventories (361.8)   (361.8)   $ (416.8)
Accrued liabilities (390.5)   (390.5)   (447.5)
Stockholders equity (233.9)   (233.9)   $ (217.6)
Accounting Standards Update 2018 02          
Item Effected [Line Items]          
Expect to decrease accumulated deficit and increase accumulated other comprehensive loss     22.1    
Accounting Standards Update 2017 07 | Cost of Sales          
Item Effected [Line Items]          
Operating change by adoption of new accounting standard   (0.9)   (3.0)  
Accounting Standards Update 2017 07 | Selling, General and Administrative Expenses          
Item Effected [Line Items]          
Operating change by adoption of new accounting standard   (3.2)   (9.4)  
Accounting Standards Update 2017 07 | Investment And Other Income Net          
Item Effected [Line Items]          
Operating change by adoption of new accounting standard   $ 4.1   $ 12.4  
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606          
Item Effected [Line Items]          
Total net sales 3.7   9.6    
Total gross profit 1.8   2.7    
Inventories 71.9   71.9    
Accrued liabilities 87.9   87.9    
Stockholders equity $ 15.6   $ 15.6