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Property, Plant and Equipment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Property, Plant and Equipment [Line Items]        
Property, plant and equipment $ 651.7 $ 618.7    
Less: accumulated depreciation (384.6) (355.0)    
Property, plant and equipment, net 267.1 [1] 263.7 [1]   $ 262.8
Computer software included in net property, plant and equipment 68.5 51.9    
Amortization of software costs 8.9 8.2 $ 7.1  
Land and improvements        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment 24.0 25.2    
Building and improvements to leaseholds        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment 145.0 144.2    
Machinery and equipment        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment 475.1 440.7    
Construction in progress        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment $ 7.6 $ 8.6    
[1]
Net property, plant and equipment as of December 31, 2019 and 2018 contained $68.5 million and $51.9 million of computer software assets, respectively, which are classified within machinery and equipment and construction in progress. Depreciation expense for software was $8.9 million, $8.2 million and $7.1 million for the years ended December 31, 2019, 2018 and 2017, respectively.