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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Valuation Allowance [Line Items]      
Document Fiscal Year Focus 2021    
Deferred tax assets, valuation allowance, judgment regarding the realizability of the beginning of the year deferred tax asset $ 39.1    
Deferred Income Taxes and Other Assets, Noncurrent 78.7 $ 19.9  
Deferred Tax Assets, Goodwill and Intangible Assets 0.6 0.0  
Deferred Tax Assets, Undistributed Foreign Earnings 1.6 0.0  
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 59.1    
Deferred tax assets:      
Accrued compensation, principally post-retirement, and other employee benefits 10.4 14.1  
Accrued expenses, principally for state income taxes and warranty 6.1 8.6  
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities 5.9 7.7  
Net operating loss and other carryforwards 70.9 71.6  
Inventories, principally due to reserves for financial reporting purposes and capitalization for tax purposes 7.7 6.5  
Convertible note hedges 0.0 1.8  
Plant and equipment, principally due to differences in depreciation 17.0 13.0  
Total gross deferred tax assets 120.2 123.3  
Valuation allowance (39.1) (98.0) $ (85.3)
Total deferred tax assets 81.1 25.3  
Deferred tax liabilities:      
Intangible assets, principally due to different tax and financial reporting bases 0.0 (4.3)  
Debt discount on convertible notes 0.0 (1.4)  
Deferred Tax Liabilities, Undistributed Foreign Earnings 0.0 (0.9)  
Other liabilities (3.0) (0.8)  
Total gross deferred tax liabilities (3.0) (7.4)  
Classified as follows in the Consolidated Balance Sheets:      
Net deferred tax asset 78.1 17.9  
Deferred Income Tax Liabilities, Net $ (0.6) $ (2.0)