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Investment Portfolio - Components of Investment Portfolio (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Investment [Line Items]    
Cash $ 2,076.8 $ 1,675.4
Money market securities 2.5 2.5
Cash and cash equivalents 2,079.3 1,677.9
Interest-bearing investments 991.2 985.9
Available-for-sale investments: 3.5 4.5
Total investment portfolio $ 3,074.0 $ 2,668.3