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Supplemental Financial Statement Information - Schedule of Other Income, Net (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Other Income and Expenses [Abstract]        
Rent and royalty income $ 0.2 $ 0.2 $ 0.5 $ 0.5
Gains from disposal of property, plant and equipment, net 1.2 0.0 2.4 2.5
Net equity (loss) gain on joint ventures 0.0 (1.9) 0.0 (5.6)
Adjustment to indemnification for conditional ARO costs 0.0 4.3 0.0 4.3
Other Nonoperating Income (Expense), Other 0.0 0.3 0.0 0.3
Other income (expense), net 1.4 0.5 2.9 (0.4)
Gain on the sale of oil and gas rights       2.5
Allegheny & Tsingshan Stainless | Employee Severance [Member]        
Other Income and Expenses [Abstract]        
Net equity (loss) gain on joint ventures $ 0.0 $ (2.4) $ 0.0 $ (2.4)