Leases - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Leases [Abstract]
Operating lease, weighted average remaining lease term	9 years
Operating lease, weighted average discount rate, percent	4.30%
Finance lease, weighted average remaining lease term	15 years
Finance lease, weighted average discount rate, percent	5.10%
Operating lease, cost	$ 17.8	$ 16.9
Finance lease, cost	0.1
Operating lease, payments	15.5	14.7
Right-of-use asset obtained in exchange for operating lease liability	3.3	4.6
Sublease income	$ 2.1	$ 2.0