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Leases - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Leases [Abstract]        
Operating lease, weighted average remaining lease term 9 years   9 years  
Finance lease, weighted average remaining lease term 15 years   15 years  
Operating lease, weighted average discount rate, percent 4.30%   4.30%  
Finance lease, weighted average discount rate, percent 5.10%   5.10%  
Operating lease, cost $ 17.8 $ 16.8 $ 35.6 $ 33.7
Finance lease, cost 0.1   0.3  
Operating lease, payments 16.4 15.9 31.8 30.5
Right-of-use asset obtained in exchange for operating lease liability 2.2 21.2 5.5 25.7
Sublease income $ 2.1 $ 2.0 $ 4.2 $ 4.0