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Leases Schedule of Lease Cost (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Finance Lease Cost:    
Amortization of right of use asset $ 0.3 $ 0.5
Interest on lease liabilities 0.1 0.2
Operating lease cost 5.3 10.4
Short-term lease cost 0.8 1.7
Variable lease cost 0.3 0.4
Sublease income 0.0 0.0
Total lease cost 6.8 13.2
Cash paid for amounts included in the measurement of lease liabilities    
Operating cash flows from finance leases 0.1 0.2
Operating cash flows from operating leases 5.3 10.4
Financing cash flows from finance leases 0.5 0.8
Right of use assets obtained in exchange for new finance lease liabilities 2.3 5.9
Right of use assets obtained in exchange for new operating lease liabilities $ 5.1 $ 17.5
Weighted average remaining lease term - finance leases 4 years 4 years
Weighted average remaining lease term - operating leases 6 years 6 years
Weighted average discount rate - finance leases 6.10% 6.10%
Weighted average discount rate - operating leases 7.20% 7.20%