Leases Maturities of Operating Lease Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Leases [Abstract]
2019 (remaining six months)	$ 6.6
2020	12.0
2021	10.2
2022	8.4
2023	7.8
Thereafter	48.9
Operating leases liabilities payments due	93.9
Less: imputed lease interest	17.3
Total lease liabilities	$ 76.6
2019		$ 13.0
2020		10.5
2021		7.8
2022		6.9
2023		5.5
Thereafter		37.8
Total		$ 81.5

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Amount of lessee's undiscounted obligation for lease payments for operating lease.

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