Leases - Lease Expense (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Leases [Abstract]
Operating lease cost included in continuing operations	$ 3.2	$ 8.9
Operating leases, weighted average remaining lease term (years)	8 years 4 months 24 days	8 years 4 months 24 days
Operating leases, weighted average discount rate (percent)	5.70%	5.70%