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Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Property Plant And Equipment [Line Items]    
Property, plant and equipment, at cost $ 7,313.5 $ 6,997.8
Less accumulated depreciation (4,120.1) (3,846.1)
Property, plant and equipment, net 3,193.4 3,151.7
Land and Land Improvements    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, at cost 179.6 177.5
Buildings    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, at cost 858.5 837.4
Machinery and Equipment    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, at cost 5,826.6 5,727.4
Construction in Progress    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, at cost 360.0 174.0
Other    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, at cost $ 88.8 $ 81.5