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Restructuring (Restructuring Charges and Reconciliation) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Restructuring Reserve [Roll Forward]      
Balance at beginning of period $ 9.3 $ 11.8 $ 9.7
Provision 6.0 10.9 12.0
Cash expenditures (11.0) (12.3) (9.9)
Non-cash Items/ Currency Change 0.2 (1.1) 0.0
Balance at end of period 4.5 9.3 11.8
Employee termination costs      
Restructuring Reserve [Roll Forward]      
Balance at beginning of period 8.1 [1] 10.7 7.9
Provision 5.2 [1] 8.5 10.9
Cash expenditures (9.7) [1] (11.1) (8.1)
Non-cash Items/ Currency Change (0.2) [1] 0.0 0.0
Balance at end of period $ 3.4 [1] 8.1 [1] 10.7
Period over which restructuring and related costs are to be paid 9 months    
Termination of lease agreements      
Restructuring Reserve [Roll Forward]      
Balance at beginning of period $ 1.0 [2] 0.6 1.8
Provision 0.7 [2] 1.5 0.5
Cash expenditures (1.1) [2] (0.7) (1.7)
Non-cash Items/ Currency Change 0.5 [2] (0.4) 0.0
Balance at end of period $ 1.1 [2] 1.0 [2] 0.6
Period over which restructuring and related costs are to be paid 6 months    
Other      
Restructuring Reserve [Roll Forward]      
Balance at beginning of period $ 0.2 0.5 0.0
Provision 0.1 0.9 0.6
Cash expenditures (0.2) (0.5) (0.1)
Non-cash Items/ Currency Change (0.1) (0.7) 0.0
Balance at end of period $ 0.0 $ 0.2 $ 0.5
[1] We expect the remaining $3.4 million employee termination costs to be substantially paid within the next nine months.
[2] We expect the remaining $1.1 million termination of lease costs to be substantially paid within the next six months.