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Acquisitions - Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill $ 4,217.4 $ 4,259.0 $ 4,351.1
ERICO Global Company [Member]      
Business Acquisition [Line Items]      
Cash 11.8 11.8  
Accounts receivable 75.9 75.9  
Inventories 101.8 102.4  
Other current assets 2.8 2.9  
Property, plant and equipment 53.1 53.4  
Identifiable intangible assets 1,033.8 1,033.8  
Goodwill 1,031.0 1,061.9  
Current liabilities 94.7 97.2  
Deferred income taxes, including current 382.3 418.8  
Other liabilities 15.1 8.0  
Purchase price $ 1,818.1 $ 1,818.1