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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Senior Notes | 2024 Senior Notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, fair value $ 447.0  
Senior Notes | 2017 Senior Notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, fair value   $ 490.9
Term Loan B    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, fair value $ 272.2 $ 358.9