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Long Term Debt - Schedule of carrying values and fair values of debt instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
CNK [Member]    
Debt Instrument [Line Items]    
Fair value [1] $ 1,921.0 $ 2,903.7
CUSA [Member]    
Debt Instrument [Line Items]    
Fair value $ 1,921.0 $ 1,902.1
[1] The fair value of the 4.50% Convertible Senior Notes was $1,001.6 as of December 31, 2024. The 4.50% Convertible Senior Notes matured on August 15, 2025.