Investment in Affiliates and Other Assets - Investment in Affiliates and Other Assets (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Other Noncurrent Assets [Line Items]
Investment in affiliates	$ 97.8	$ 102.3
Other assets:
Land held for development	156.5	158.1
Restricted cash	33.3	33.3
Deferred financing costs	8.4	2.6
IBNR receivables	7.0	6.9
Capital lease deposit	6.2	6.2
Intangible assets	5.1	5.2
Pension asset	0.6	0.6
Other	40.0	64.9
Total	315.1	337.3
LPC | TiO2 manufacturing joint venture
Other Noncurrent Assets [Line Items]
Investment in affiliates	97.8	102.3
Capitalized Operating Permits
Other assets:
Waste disposal site operating permits, net	$ 58.0	$ 59.5