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Leases - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lessor, operating lease, term of contract   20 years
Residual value of leased asset $ 70.6 $ 70.1
Carrying value of investment lease 1,900.0 1,400.0
Amortization of ROU assets $ 20.0 38.4
Operating Lease, extension terms the vast majority of which include one or more options to extend the leases for up to five years resulting in lease terms up to 40 years  
Other Income    
Gain on sale of branch property   7.9
Discontinued Operations    
Amortization of ROU assets   $ 11.7
Minimum    
Lessor, operating lease, term of contract 24 months  
Operating lease, remaining lease term 1 year  
Maximum    
Lessor, operating lease, term of contract 120 months  
Operating lease, remaining lease term 25 years