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Restructuring Activities - Restructuring Expense (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Restructuring Cost and Reserve [Line Items]    
Restructuring charges $ 1.1 $ 0.6
Integration and restructuring of business acquisitions    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges 0.0 0.1
2020 Restructuring    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges 0.2 0.0
Post-Divestiture Restructuring Plan | Post divestiture restructuring plan    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges $ 0.9 $ 0.5