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Reconciliation of Beginning and Ending Amounts of Unrecognized Tax Benefits (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Balance at January 1 $ 647.0 [1] $ 1,504.9
Decreases for positions taken in prior years (82.1) (579.4)
Increases for positions taken in prior years 27.5 49.8
Increases for positions related to the current year 40.5 100.3
Settlements with taxing authorities (45.2) (428.1)
Lapsing of statutes of limitations 0.0 (0.5)
Balance at December 31 [1] 587.7 647.0
Long-term income taxes    
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Balance at January 1 619.6  
Balance at December 31 318.5 619.6
Prepaid expenses and other current assets    
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Balance at January 1 27.3  
Balance at December 31 $ 269.2 $ 27.3
[1] Of this amount, $318.5 million and $619.6 million are included in Long-term income taxes for 2023 and 2022, respectively, and $269.2 million and $27.3 million are included in Income taxes for 2023 and 2022, respectively, on the Consolidated Balance Sheet.