Commitments and Contingencies - Future Minimum Operating Lease Payments and Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Mar. 31, 2019	Jan. 01, 2019
Commitments and Contingencies Disclosure [Abstract]
2019	$ 32.9
2020	47.3
2021	40.4
2022	32.7
2023	29.8
Thereafter	60.3
Total lease payments	243.4
Less: interest	(30.0)
Total	213.4
Current operating lease liabilities	36.7
Long-term operating lease liabilities	$ 176.7	$ 185.5