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Fair Value Measurements and Investments Fair Value of Long-Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Long-term debt less unamortized discounts and debt issuance costs $ 1,210.4  
Long-term debt 1,200.4 $ 1,199.1
Total long-term debt, excluding leases and current maturities 1,107.5 1,112.1
Senior Notes | Senior Notes    
Debt Instrument [Line Items]    
Long-term debt less unamortized discounts and debt issuance costs 1,191.2 1,189.5
Total long-term debt, excluding leases and current maturities 1,098.3 1,102.5
Other Long-Term Debt | Other Long-Term Debt    
Debt Instrument [Line Items]    
Long-term debt less unamortized discounts and debt issuance costs 9.2 9.6
Total long-term debt, excluding leases and current maturities $ 9.2 $ 9.6