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Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance of gross unrecognized tax benefits at the beginning of the fiscal year $ 127.2 $ 107.3 $ 91.4
Gross increases related to prior period tax positions 3.4 0.0 0.0
Gross decreases related to prior period tax positions (0.7) 0.0 (0.3)
Gross increases related to current period tax positions 21.1 20.3 18.5
Reductions due to lapse in statute of limitations (1.2) (0.4) (1.5)
Reductions due to settlements with taxing authorities 0.0 0.0 (0.8)
Balance of gross unrecognized tax benefits at the end of the fiscal year $ 149.8 $ 127.2 $ 107.3