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Acquisitions (Details) - USD ($)
$ in Millions
Apr. 17, 2017
Jun. 30, 2017
Sep. 30, 2016
Business Acquisition [Line Items]      
Goodwill   $ 2,621.3 $ 2,478.4
AAG Acquisition [Member]      
Business Acquisition [Line Items]      
Business Combination, Consideration Transferred $ 255.2    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory   16.0  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment   0.8  
Goodwill   123.8  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   110.4  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets   0.9  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable   (4.7)  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net   $ 255.2