Leases - Lease Cost (Details 3) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Leases [Abstract]
Operating Lease, Cost	$ 5.7	$ 5.3	$ 11.3	$ 10.7
Short-term Lease, Cost	0.8		1.4
Variable Lease, Cost	1.0		1.6
Finance Lease, Cost [Abstract]
Finance Lease Cost	0.1	0.0	0.2	0.0
Lease, Cost	$ 5.8	$ 5.3	$ 11.5	$ 10.7