Reconciliation of Segment Operating Income (Loss) to Consolidated Loss Before Income Taxes (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating profit (loss)	$ (19.9)	$ 1.6
Interest expense	(2.0)	(2.7)
Other income (expense), net	(9.8)	(4.9)
Total loss before income taxes	(31.7)	(6.0)
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating profit (loss)	(3.6)	22.7
Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating profit (loss)	$ (16.3)	$ (21.1)