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Commitments and Contingent Liabilities - Lease Commitments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]      
Rent expense net of sublease rental income $ 7.3 $ 6.8 $ 7.8
Operating Leases, Rent Expense, Sublease Rentals 2.3 $ 2.2 $ 1.3
Capital Leases [Abstract]      
2018 2.3    
2019 2.3    
2020 2.3    
2021 2.3    
2022 2.3    
2023 and thereafter 2.6    
Total minimum lease payments 14.1    
Capital Leases, Future Minimum Sublease Rentals 0.0    
Capital Leases, Future Minimum Payments, Net Minimum Payments 14.1    
Capital Leases, Future Minimum Payments, Interest Included in Payments (1.6)    
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments 12.5    
Operating Lease Future Minimum Payments [Abstract]      
2018 9.7    
2019 9.3    
2020 8.8    
2021 8.1    
2022 6.1    
2023 and thereafter 3.8    
Total minimum lease payments 45.8    
Future operating lease payments 45.8    
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals (8.8)    
Operating Leases, Future Minimum Payments, Net Minimum Payments $ 37.0