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USM Acquisition Table (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Mar. 01, 2017
Business Acquisition [Line Items]          
Adjusted purchase price, net of cash acquired   $ 1.3 $ 895.5    
Goodwill   $ 1,633.0   $ 1,654.3  
USM Mexico Manufacturing LLC [Member]          
Business Acquisition [Line Items]          
Contractual purchase price $ 162.5        
Adjustment to contractual purchase price for working capital settlement         $ 2.5
Adjustment to contractual purchase price for capital equipment         4.9
Adjustment to contractual purchase price for settlement of existing accounts payable balance         (22.8)
Cash acquired         (0.5)
Adjusted purchase price, net of cash acquired $ 146.6        
Accounts receivable         1.1
Inventories         4.8
Prepaid expenses and other         3.6
Property, plant and equipment         38.4
Intangible assets         31.7
Total assets acquired         79.6
Accounts payable         10.8
Accrued expenses and other         2.7
Deferred income tax liabilities         1.2
Net assets acquired         64.9
Goodwill         $ 81.7