Goodwill - Changes in Carrying Amount of Goodwill (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			12 Months Ended				12 Months Ended
	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Cost [Member]	Dec. 31, 2012 Cost [Member]	Dec. 31, 2013 Accumulated Impairment [Member]	Dec. 31, 2011 Accumulated Impairment [Member]	Dec. 31, 2013 Goodwill Carrying Amount [Member]	Dec. 31, 2012 Goodwill Carrying Amount [Member]
Goodwill [Roll Forward]
Goodwill cost, beginning balance				$ 98.5	$ 98.2
Goodwill, Accumulated Impairment, beginning balance						(1.5)	(1.5)
Impairment charge	(6.8)					(6.8)		(6.8)
Changes in purchase price allocation				2.0				2.0
Goodwill, Accumulated Impairment, ending balance						(8.3)	(1.5)
Goodwill, carrying amount, beginning balance		92.0	97.0					97.0	96.7
Acquisitions					0.2				0.2
Changes due to foreign currency translation				(0.2)	0.1			(0.2)	0.1
Goodwill, carrying amount, ending balance		92.0	97.0					92.0	97.0
Goodwill cost, ending balance				$ 100.3	$ 98.5