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Income Taxes - Reconciliation of Liability for Uncertain Tax Positions (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Income Tax Disclosure [Abstract]  
Balance at the beginning of the year $ 109.1
Additions for tax positions 6.1
Reductions for tax positions (0.6)
Balance at the end of the year $ 114.6