Other Assets (Detail) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Other assets
Investments in nonconsolidated affiliates (Note 5)	$ 132.3	$ 133.7
Right-of-use lease assets	71.1	71.2
Assets Held-in-trust, Noncurrent	10.7	12.7
Deposits	4.5	4.1
Notes receivable from affiliated companies	4.0	4.0
Deferred financing fees	1.8	1.9
Other	9.0	8.7
Total other assets	$ 233.4	$ 236.3