Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Property Plant And Equipment [Line Items]
Property, plant and equipment, at cost	$ 6,997.8	$ 6,691.1
Less accumulated depreciation	(3,846.1)	(3,582.5)
Property, plant and equipment, net	3,151.7	3,108.6
Land and Land Improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment, at cost	177.5	161.9
Buildings
Property Plant And Equipment [Line Items]
Property, plant and equipment, at cost	837.4	795.5
Machinery and Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment, at cost	5,727.4	5,481.6
Construction in Progress
Property Plant And Equipment [Line Items]
Property, plant and equipment, at cost	174.0	176.7
Other
Property Plant And Equipment [Line Items]
Property, plant and equipment, at cost	$ 81.5	$ 75.4