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Restructuring Expenses (Narrative) (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2021
USD ($)
employees
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Restructuring Cost and Reserve [Line Items]        
Number of employees terminated | employees   150    
Controlling interest ownership percentage 50.00%      
Proceeds from divestiture of interest in joint venture $ 5.1      
Restructuring expenses   $ 20.1 $ 20.1 $ 9.7
Provision reversal   (4.8) (0.4) (0.7)
Loss on Sale of Joint Venture        
Restructuring Cost and Reserve [Line Items]        
Restructuring expenses   0.0 0.0 2.1
Provision reversal   (2.5) $ 0.0 $ 0.0
Gain On Sale of Joint Venture        
Restructuring Cost and Reserve [Line Items]        
Provision reversal   $ 2.5