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Other Operating Credits and Charges, Net Non-Operating Income and Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Interest Expense   $ 17.0 $ 18.0 $ 19.0
Amortization of financing costs and discounts   2.0 2.0 1.0
Interest Costs Capitalized Adjustment   0.0 1.0 4.0
Interest expense, net of capitalized interest   (19.0) (19.0) (16.0)
Investment Income, Interest and Dividend   2.0 9.0 18.0
Realized Investment Gains (Losses)   3.0 0.0 1.0
Interest Income, Other   (1.0) 1.0 (1.0)
Investment income   4.0 10.0 18.0
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component   1.0 3.0 4.0
Foreign Currency Transaction Gain (Loss), Realized   1.0 (5.0) 0.0
Gain on Acquisition   0.0 14.0 0.0
Other nonoperating items   $ 0.0 $ 6.0 $ (4.0)
Entekra [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Gain on Acquisition $ 14.0