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Significant Accounting Policies - Schedule of Interest and Other Income (Expense), Net (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]      
Pension and postretirement benefit (expense) $ (2.6) $ (3.1) $ (3.0)
Interest income 1.7 3.0 1.5
Gain (loss) on sale of joint venture interest 0.0 2.6 4.2
Reductions in solar investments, net 0.0 (0.1) (0.5)
Other income (expense) 1.2 0.8 0.1
Interest and other income (expense), net $ 0.3 $ 3.2 $ 2.3