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Leasing Leasing (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Leases [Abstract]      
Operating Lease, Right-of-Use Asset $ 139.0 $ 139.0 $ 137.0
Lease, Cost [Abstract]      
Weighted-average remaining lease term 10 years 10 years  
Weighted-average discount rate operating leases 3.50% 3.50%  
Operating lease cost recognized as occupancy and equipment expense $ 5.7 $ 12.1  
Operating cash flows from operating leases 5.5 11.4  
Short-term Lease, Cost 3.7 6.1  
Finance Lease, Liability, Payment, Due, Rolling Maturity [Abstract]      
Lessee, Operating Lease, Liability, Payments, Due Next Rolling Twelve Months 17.7 17.7  
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Two 28.9 28.9  
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Three 26.1 26.1  
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Four 18.9 18.9  
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Five 16.5 16.5  
Lessee, Operating Lease, Liability, Payments, Due after Rolling Year Five $ 104.2 $ 104.2