Other Noncurrent Assets - Schedule of Other Noncurrent Assets (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Other Noncurrent Assets [Line Items]
Deferred financing costs, net	$ 3.9	$ 7.0
Restricted cash	7.3	7.5
Pension asset	4.7	5.1
Other	9.2	9.5
Total	$ 25.1	$ 29.1