Leases Schedule of Lease Cost (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Finance Lease Cost:
Amortization of right of use asset	$ 0.2
Interest on lease liabilities	0.1
Operating lease cost	5.1
Short-term lease cost	0.9
Variable lease cost	0.1
Sublease income	0.0
Total lease cost	6.4
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from finance leases	0.1
Operating cash flows from operating leases	5.1
Finance cash flows from finance leases	0.3
Right of use assets obtained in exchange for new finance lease liabilities	3.6
Right of use assets obtained in exchange for new operating lease liabilities	$ 12.4
Weighted average remaining lease term - finance leases	4 years 2 months 19 days
Weighted average remaining lease term - operating leases	5 years 10 months 17 days
Weighted average discount rate - finance leases	6.30%
Weighted average discount rate - operating leases	7.40%