Leases - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Leases [Abstract]
Rent expense for operating leases	$ 9.6
Operating cash flows from operating leases	8.5
Operating leases	$ 2.2
Operating lease, weighted average remaining lease term	5 years
Operating lease, weighted average discount rate	3.80%