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Restructuring - Summary of Changes in Restructuring Accrual (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Restructuring Cost And Reserve [Line Items]        
Balance at December 31, 2019     $ 5.7  
Severance payments     (2.4)  
Accretion of interest $ 0.1 $ 0.1 0.3 $ 0.3
Balance at June 30, 2020 3.6   3.6  
2018 Restructuring Activities        
Restructuring Cost And Reserve [Line Items]        
Balance at December 31, 2019     4.2  
Severance payments     (1.0)  
Accretion of interest     0.3  
Balance at June 30, 2020 3.5   3.5  
2019 Restructuring Activities        
Restructuring Cost And Reserve [Line Items]        
Balance at December 31, 2019     1.5  
Severance payments     (1.4)  
Balance at June 30, 2020 $ 0.1   $ 0.1