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Leases - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Leases [Abstract]        
Operating lease, weighted average remaining lease term 23 years   23 years  
Operating lease, weighted average discount rate, percent 4.70%   4.70%  
Finance lease, weighted average remaining lease term 14 years   14 years  
Finance lease, weighted average discount rate, percent 5.20%   5.20%  
Operating lease, cost $ 2.3 $ 1.4 $ 5.1 $ 2.9
Finance lease, cost 0.1 0.1 0.4 0.5
Operating lease, payments 1.2   3.2 2.9
Right-of-use asset obtained in exchange for operating lease liability 2.4   9.2 0.7
Sublease income $ 2.7 $ 2.1 $ 6.9 $ 6.1