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Income Taxes - Summary of Unrecognized Tax Benefit Activity (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Gross unrecognized tax benefits, beginning of year $ 60.9 $ 65.9 $ 32.2
Increases in prior year tax positions 4.6 1.4 35.7
Decreases in prior year tax positions (0.4) (4.1) (2.6)
Increases for current year tax positions 9.0 3.2 4.7
Expiration of statute of limitations and audit settlements (6.8) (5.5) (4.1)
Gross unrecognized tax benefits, end of year 67.3 60.9 65.9
Potential interest and penalties 4.5 3.6 3.6
Balance, end of year $ 71.8 $ 64.5 $ 69.5