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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Valuation Allowance [Line Items]    
Document Fiscal Year Focus 2018  
Deferred tax assets, valuation allowance, judgment regarding the realizability of the beginning of the year deferred tax asset $ 131.2 $ 99.7
Amount of change in deferred tax assets valuation allowance 1.0  
Deferred tax assets:    
Accrued compensation, principally post-retirement, and other employee benefits 15.1 13.7
Accrued expenses, principally for state income taxes, interest, and warranty 4.6 5.9
Net operating loss and other carryforwards 155.9 115.6
Inventories, principally due to reserves for financial reporting purposes and capitalization for tax purposes 3.9 3.6
Convertible Note Hedges 5.7 7.3
Plant and equipment, principally due to differences in depreciation 9.4 9.6
Total gross deferred tax assets 194.6 155.7
Valuation allowance (131.2) (99.7)
Total deferred tax assets 63.4 56.0
Deferred tax liabilities:    
Intangible assets, principally due to different tax and financial reporting bases and amortization lives (8.7) (10.3)
Debt discount on convertible notes (4.4) (5.7)
Other liabilities (37.2) (17.6)
Total gross deferred tax liabilities (50.3) (33.6)
Classified as follows in the Consolidated Balance Sheets:    
Other assets and deferred charges (non-current deferred tax assets) 15.2 22.4
Deferred income taxes (non-current deferred tax liabilities) (2.1) 0.0
Net deferred tax asset $ 13.1 $ 22.4