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Leases - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Lessee, Lease, Description [Line Items]      
Weighted-average remaining lease term for lease portfolio 10 years 1 month 6 days    
Weighted average discount rate (as a percent) 5.00%    
Lease expense $ 13.9 $ 18.5 $ 21.0
Cash payments for operating leases $ 11.0    
Operating lease commitments, 2019   10.4  
Operating lease commitments, 2020   9.9  
Operating lease commitments, 2021   11.7  
Operating lease commitments, 2022   10.9  
Operating lease commitments, 2023   10.3  
Operating lease commitments, thereafter   $ 73.9  
Minimum      
Lessee, Lease, Description [Line Items]      
Remaining lease term 1 year    
Maximum      
Lessee, Lease, Description [Line Items]      
Remaining lease term 15 years