Commitments and Contingencies Commitments and Contingencies - Future Minimum Rental Payments (Details) $ in Millions	Dec. 31, 2018 USD ($)
Operating Leases
2019	$ 33.7
2020	30.7
2021	24.3
2022	17.0
2023	14.3
Thereafter	26.3
Total	146.3
Other Lease Arrangement
2019	13.1
2020	13.3
2021	13.6
2022	13.9
2023	14.2
Thereafter	32.9
Total	$ 101.0