Right-of-Use Lease Assets and Lease Liabilities (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Leases [Abstract]
Operating lease, right-of-use asset	$ 30.5
Operating lease, liability	30.4
Operating lease, expense	$ 2.6
Operating ease, weighted average discount rate, percent	3.46%
Operating lease, weighted average remaining lease term	9 years 3 months 15 days