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Leases - Future Minimum Payments (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Operating Leases    
Next 12 months $ 8.7  
12 to 24 months 7.8  
24 to 36 months 7.2  
36 to 48 months 6.7  
48 to 60 months 2.4  
Thereafter 10.6  
Total lease payments 43.4  
Less imputed interest 4.4  
Total 39.0  
Finance Leases    
Next 12 months 1.0  
12 to 24 months 0.8  
24 to 36 months 0.5  
36 to 48 months 0.3  
48 to 60 months 0.1  
Thereafter 0.0  
Total lease payments 2.7  
Less imputed interest 0.1  
Total 2.6 $ 2.7
Total    
Next 12 months 9.7  
12 to 24 months 8.6  
24 to 36 months 7.7  
36 to 48 months 7.0  
48 to 60 months 2.5  
Thereafter 10.6  
Total lease payments 46.1  
Less imputed interest 4.5  
Total $ 41.6