Leases - Narrative (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)
Leases [Abstract]
Term of leases	10 years	10 years
Options to extend, term	5 years	5 years
Rent expense for operating leases	$ 9.4	$ 19.0
Operating cash flows from operating leases	9.2	17.7
Operating leases	$ 4.7	$ 6.9
Operating lease, weighted average remaining lease term	5 years	5 years
Operating lease, weighted average discount rate	3.80%	3.80%