Commitments and Contingencies - Components of Lease Expense and Other Information (Details) $ in Millions	12 Months Ended
Dec. 31, 2019 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Short-term Lease, Cost	$ 0.0
Finance Lease amortization	0.1
Sublease Income	0.0
Operating lease cost	10.0
Variable lease cost	2.0
Lease cost	12.0
Operating cash flows from operating leases	11.0
Finance lease payments (de minimis for 2019)	0.0
ROU assets obtained in exchange for new operating lease liabilities	37.0
ROU assets obtained in exchange for new finance lease liabilities	$ 2.0

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Amount of cash outflow for principal payment on finance lease.

+ References

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Amount of amortization expense attributable to right-of-use asset from finance lease.

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Amount of lease cost recognized by lessee for lease contract.

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Amount of increase in right-of-use asset obtained in exchange for finance lease liability.

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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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Amount of short-term lease cost, excluding expense for lease with term of one month or less.

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Amount of sublease income excluding finance and operating lease expense.

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Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

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