Leases Maturities of Operating Lease Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Leases [Abstract]
2019 (remaining three months)	$ 3.4
2020	12.0
2021	10.2
2022	8.3
2023	7.7
Thereafter	48.1
Operating leases liabilities payments due	89.7
Less: imputed lease interest	16.4
Total lease liabilities	$ 73.3
2019		$ 13.0
2020		10.5
2021		7.8
2022		6.9
2023		5.5
Thereafter		37.8
Total		$ 81.5