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Leases - Components of Lease Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lease Cost    
Interest expense on lease liabilities $ 0.2 $ 0.2
Amortization of right-of-use assets 0.5 0.4
Operating lease cost 6.8 6.2
Short-term lease expense 0.4 0.3
Variable lease expense 0.0 0.0
Sublease income 0.0 0.0
Total Lease Cost $ 7.9 $ 7.1