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Accumulated Other Comprehensive Income (Loss) - Schedule Of Accumulated Other Comprehensive Income Loss (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance $ (0.6)    
Other comprehensive income before reclassifications (118.8)    
Amounts reclassified from accumulated other comprehensive income 21.5    
Net current period other comprehensive income (97.3) $ (41.3) $ 19.0
Ending balance (97.9) (0.6)  
Unrealized Gains (losses) on marketable securities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (1.2)    
Other comprehensive income before reclassifications (93.4)    
Amounts reclassified from accumulated other comprehensive income    
Net current period other comprehensive income (93.4)    
Ending balance (94.6) (1.2)  
Unrealized Gains (losses) on cash flow hedges      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance 0.6    
Other comprehensive income before reclassifications (25.4)    
Amounts reclassified from accumulated other comprehensive income 21.5    
Net current period other comprehensive income (3.9)    
Ending balance $ (3.3) $ 0.6