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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Fair Value Disclosures [Abstract]          
Losses (gains) on marketable and other securities, net $ 254.3 $ (29.1) $ (120.6) $ 523.8  
Securities owned not readily marketable 48.3   48.3   $ 40.0
Long-term debt fair value $ 1,400.0   $ 1,400.0   $ 1,887.0