Stockholders' Equity (Deficit) Accumulated Other Comprehensive Income and Redeemable Noncontrolling Interest - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income (loss) before income taxes	$ (39.8)	$ 6.2	$ (30.5)	$ 14.6
Tax provision	(13.4)	2.9	(7.8)	6.2
Net of tax	(26.4)	3.3	(22.7)	8.4
Benefit Plan Liabilities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income (loss) before income taxes	0.2	1.3	0.7	3.9
Tax provision		0.1	0.1	0.4
Net of tax	0.2	1.2	0.6	3.5
Benefit Plan Liabilities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Operating Expense [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Actuarial loss	0.6	1.6	1.8	4.9
Prior service credits	$ (0.4)	$ (0.3)	$ (1.1)	$ (1.0)