Reclassification out of AOCI (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Gains/(losses) on foreign currency translation adjustments
Liquidation of foreign subsidiary				$ 0.1
Total gains/(losses) on currency translation adjustments				0.1
Cash Flow Hedges, net of tax:
Losses on cash flow hedges - Pre Tax	$ 1.3		$ 0.9
Losses on cash flow hedges - Tax	(0.4)		(0.3)
Losses on cash flow hedges - Net of Tax	0.9		0.6
Gains/(losses) on available for sale securities:
Gains on available for sale securities		$ 0.6		0.8
Pension and Other Post-Retirement Benefits, net of tax:
Amortization of actuarial losses and prior service costs included in net income - Pre Tax	(2.4)	(3.4)	(7.3)	(10.3)
Amortization of actuarial losses and prior service costs included in net income - Tax	0.9	1.3	2.8	3.9
Amortization of actuarial losses and prior service costs included in net income - Net of Tax	(1.5)	(2.1)	(4.5)	(6.4)
Income Loss Attributable to Reclassification Out Of AOCI Net Of Tax	(0.6)	(1.5)	(3.9)	(5.5)
Operating Expense [Member]
Pension and Other Post-Retirement Benefits, net of tax:
Amortization of actuarial losses and prior service costs included in net income - Pre Tax	(1.5)	(2.1)	(4.6)	(6.4)
Other Nonoperating Income (Expense) [Member]
Gains/(losses) on foreign currency translation adjustments
Liquidation of foreign subsidiary				0.1
Gains/(losses) on available for sale securities:
Gains on available for sale securities		0.6		0.8
SG&A Expense [Member]
Pension and Other Post-Retirement Benefits, net of tax:
Amortization of actuarial losses and prior service costs included in net income - Pre Tax	(0.9)	$ (1.3)	(2.7)	$ (3.9)
Cross-Currency Swap [Member] | Other Nonoperating Income (Expense) [Member]
Cash Flow Hedges, net of tax:
Losses on cash flow hedges - Pre Tax	$ 1.3		$ 0.9