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Fair Value Measurements - Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 28, 2024
Sep. 30, 2023
Assets:    
Fair Value $ 992.9 $ 0.0
Total 996.8 35.3
Liabilities:    
Contingent consideration 1.1 2.0
Total 13.9 2.0
Quoted Prices in Active Market for Identical Assets (Level 1)    
Assets:    
Total 992.9 0.0
Liabilities:    
Contingent consideration 0.0 0.0
Total 0.0 0.0
Significant Other Observable Inputs (Level 2)    
Assets:    
Total 3.9 35.3
Liabilities:    
Contingent consideration 0.0 0.0
Total 12.8 0.0
Significant Unobservable Inputs (Level 3)    
Assets:    
Total 0.0 0.0
Liabilities:    
Contingent consideration 1.1 2.0
Total 1.1 2.0
Interest Rate Swap    
Assets:    
Interest rate caps - derivative 3.1 26.9
Liabilities:    
Interest rate swaps 0.2  
Interest Rate Swap | Quoted Prices in Active Market for Identical Assets (Level 1)    
Assets:    
Interest rate caps - derivative 0.0 0.0
Liabilities:    
Interest rate swaps 0.0  
Interest Rate Swap | Significant Other Observable Inputs (Level 2)    
Assets:    
Interest rate caps - derivative 3.1 26.9
Liabilities:    
Interest rate swaps 0.2  
Interest Rate Swap | Significant Unobservable Inputs (Level 3)    
Assets:    
Interest rate caps - derivative 0.0 0.0
Liabilities:    
Interest rate swaps 0.0  
Forward foreign currency contracts    
Assets:    
Foreign currency option contracts 0.8 8.4
Liabilities:    
Forward foreign currency contracts 12.6  
Forward foreign currency contracts | Quoted Prices in Active Market for Identical Assets (Level 1)    
Assets:    
Foreign currency option contracts 0.0 0.0
Liabilities:    
Forward foreign currency contracts 0.0  
Forward foreign currency contracts | Significant Other Observable Inputs (Level 2)    
Assets:    
Foreign currency option contracts 0.8 8.4
Liabilities:    
Forward foreign currency contracts 12.6  
Forward foreign currency contracts | Significant Unobservable Inputs (Level 3)    
Assets:    
Foreign currency option contracts 0.0 $ 0.0
Liabilities:    
Forward foreign currency contracts 0.0  
Money Market Funds    
Assets:    
Cash and cash equivalents 341.7  
Money Market Funds | Quoted Prices in Active Market for Identical Assets (Level 1)    
Assets:    
Cash and cash equivalents 341.7  
Money Market Funds | Significant Other Observable Inputs (Level 2)    
Assets:    
Cash and cash equivalents 0.0  
Money Market Funds | Significant Unobservable Inputs (Level 3)    
Assets:    
Cash and cash equivalents 0.0  
US Treasury Securities    
Assets:    
Fair Value 626.3  
US Treasury Securities | Quoted Prices in Active Market for Identical Assets (Level 1)    
Assets:    
Fair Value 626.3  
US Treasury Securities | Significant Other Observable Inputs (Level 2)    
Assets:    
Fair Value 0.0  
US Treasury Securities | Significant Unobservable Inputs (Level 3)    
Assets:    
Fair Value 0.0  
Commercial Paper    
Assets:    
Cash and cash equivalents 24.9  
Commercial Paper | Quoted Prices in Active Market for Identical Assets (Level 1)    
Assets:    
Cash and cash equivalents 24.9  
Commercial Paper | Significant Other Observable Inputs (Level 2)    
Assets:    
Cash and cash equivalents 0.0  
Commercial Paper | Significant Unobservable Inputs (Level 3)    
Assets:    
Cash and cash equivalents $ 0.0