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Fair Value Measurements and Investments Fair Value of Long-Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Long-term debt less unamortized discounts and debt issuance costs $ 1,210.1  
Long-term debt 1,199.1 $ 1,197.7
Total long-term debt, excluding leases and current maturities 1,112.1 1,066.1
Senior Notes | Senior Notes    
Debt Instrument [Line Items]    
Long-term debt less unamortized discounts and debt issuance costs 1,189.5 1,187.6
Total long-term debt, excluding leases and current maturities 1,102.5 1,056.0
Other Long-Term Debt | Other Long-Term Debt    
Debt Instrument [Line Items]    
Long-term debt less unamortized discounts and debt issuance costs 9.6 10.1
Total long-term debt, excluding leases and current maturities $ 9.6 $ 10.1