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Leases - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Lessor, operating lease, term of contract       20 years
Residual value of leased asset $ 63.0   $ 70.6 $ 70.1
Carrying value of investment lease 2,000.0   1,900.0 1,400.0
Amortization of ROU assets $ 4.7 $ 4.1 $ 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.   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 years   24 months  
Operating lease, remaining lease term 1 year   1 year  
Maximum        
Lessor, operating lease, term of contract 120 years   120 months  
Operating lease, remaining lease term 25 years   25 years