Accumulated Other Comprehensive Loss - Summary of Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income Tax Expense (Benefit)	$ 3.2		$ 5.5		$ 4.2		$ 6.6
Net income	8.3		8.0		9.6		16.6
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Actuarial losses	0.7	[1]	2.2	[1]	1.4	[1]	4.4	[1]
Prior service costs	0.1	[1]	0.1	[1]	0.1	[1]	0.1	[1]
Total before tax	0.8		2.3		1.5		4.5
Income Tax Expense (Benefit)	(0.3)		(0.9)		(0.6)		(1.6)
Net income	0.5		1.4		0.9		2.9
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net income					0		0.6
Foreign Exchange Contract [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income Tax Expense (Benefit)					0		(0.4)
Foreign exchance contracts					$ 0		$ 1.0

[1] These accumulated other comprehensive income components are included in the computation of net periodic pension cost. (See Note 10 – “Pensions and Postretirement Benefits” for additional details).