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Restructuring Activities - Liability Balance Associated with major Cash-based Charges (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Restructuring Cost and Reserve [Line Items]      
Expense incurred     $ 0.0
Employee separation benefits      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Beginning Balance $ 37.0 $ 0.0  
Expense incurred 82.0 82.0  
Payments made (106.0) (45.0)  
Restructuring Reserve, Ending Balance 13.0 37.0 0.0
Professional fees      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Beginning Balance 10.0 0.0  
Expense incurred 32.0 23.0  
Payments made (42.0) (13.0)  
Restructuring Reserve, Ending Balance $ 0.0 $ 10.0 $ 0.0