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Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Property Plant And Equipment [Line Items]    
Property, plant and equipment, at cost $ 6,691.1 $ 6,311.2
Less accumulated depreciation (3,582.5) (3,386.3)
Property, plant and equipment, net 3,108.6 2,924.9
Land and Land Improvements    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, at cost 161.9 156.0
Buildings    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, at cost 795.5 729.8
Machinery and Equipment    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, at cost 5,481.6 5,162.5
Construction in Progress    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, at cost 176.7 194.5
Other    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, at cost $ 75.4 $ 68.4