Other Assets - Other Assets (Detail) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Other noncurrent assets:
Restricted cash and cash equivalents	$ 31.2	$ 37.2
Note receivables - OPA	47.4	49.3
Operating lease right-of-use assets	21.6	21.5
Land held for development	18.9	29.7
IBNR receivables	14.2	16.8
Pension asset	8.8	9.3
Other	20.6	24.3
Total	$ 162.7	$ 188.1