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Supplemental Financial Data - Other Income (Expense) - Net (Details) - USD ($)
$ in Millions
12 Months Ended
Jul. 06, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Jan. 18, 2022
Dec. 20, 2021
Feb. 08, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]              
Non-operating pension income (expense)   $ 42.2 $ 53.7 $ 46.2      
Change in fair value of make-whole derivative liability   0.0 0.0 (32.8)      
Debt redemption premium   (16.3) (29.5) (50.1)      
Miscellaneous other income (expense) – net   (12.0) (9.3) 25.1      
Other income (expense) – net   13.9 $ 14.9 $ (11.6)      
10.250% Senior Unsecured Notes Due 2027              
Valuation Allowance [Line Items]              
Payment of call premium $ 30.8            
10.250% Senior Unsecured Notes Due 2027 | Unsecured Debt              
Valuation Allowance [Line Items]              
Interest rate on debt instrument (as a percent)     10.25% 10.25%     10.25%
Payment of call premium   $ 29.5   $ 30.8      
6.875% Senior Secured Notes Due 2026              
Valuation Allowance [Line Items]              
Payment of call premium $ 19.3            
6.875% Senior Secured Notes Due 2026 | Secured Debt              
Valuation Allowance [Line Items]              
Interest rate on debt instrument (as a percent)   6.875% 6.875% 6.875% 6.875% 6.875% 6.875%
Payment of call premium   $ 16.3   $ 19.3