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Other Assets (Detail) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Other assets    
Investments in affiliated companies (Note 5) $ 139.9 $ 138.8
Right-of-use lease assets 64.4 65.6
Interest rate swaps (Notes 2 and 8) 4.4 0.0
Other 43.0 31.7
Total other assets $ 251.7 $ 236.1