Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies- Effect of New Adoption (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset	$ 29.4
Operating Lease, Liability	30.0
Operating Lease, Liability, Current	8.7	$ 0.0
Operating Lease, Cost	3.0
Short-term and variable lease cost	3.4
Lease, Cost	6.4
Operating Lease, Payments	3.0
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 3.6
Operating Lease, Weighted Average Discount Rate, Percent	6.80%
Operating Lease, Weighted Average Remaining Lease Term	7 years 4 months 24 days
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 8.0
Lessee, Operating Lease, Liability, Payments, Due Year Two	8.3
Lessee, Operating Lease, Liability, Payments, Due Year Three	5.4
Lessee, Operating Lease, Liability, Payments, Due Year Four	3.7
Lessee, Operating Lease, Liability, Payments, Due Year Five	2.2
Lessee, Operating Lease, Liability, Payments, Due after Year Five	11.2
Lessee, Operating Lease, Liability, Payments, Due	38.8
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	$ 8.8