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Other Assets - Other Assets (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Other noncurrent assets:    
Land held for development $ 102.9 $ 125.3
Operating lease right-of-use assets 26.7 29.0
Restricted cash and cash equivalents 33.5 33.0
IBNR receivables 8.1 8.5
Marketable securities 5.4 6.2
Pension asset 8.0 7.4
Note receivables - OPA 27.6 8.8
Other 7.4 11.9
Total $ 219.6 $ 230.1