Reclassification out of AOCI (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 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	$ (2.6)		$ (0.4)
Losses on cash flow hedges - Tax	0.9		0.1
Losses on cash flow hedges - Net of Tax	(1.7)		(0.3)
Gains/(losses) on available for sale securities:
Gains on available for sale securities		$ 0.2		0.2
Pension and Other Post-Retirement Benefits, net of tax:
Amortization of actuarial losses and prior service costs included in net income - Pre Tax	(2.3)	(3.1)	(4.9)	(6.9)
Amortization of actuarial losses and prior service costs included in net income - Tax	0.9	1.1	1.9	2.6
Amortization of actuarial losses and prior service costs included in net income - Net of Tax	(1.4)	(2.0)	(3.0)	(4.3)
Income Loss Attributable to Reclassification Out Of AOCI Net Of Tax	(3.1)	(1.8)	(3.3)	(4.0)
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)	(2.0)	(3.1)	(4.3)
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		0.2		0.2
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	(0.8)	$ (1.1)	(1.8)	$ (2.6)
Cross-Currency Swap [Member] | Other Nonoperating Income (Expense) [Member]
Cash Flow Hedges, net of tax:
Losses on cash flow hedges - Pre Tax	$ (2.6)		$ (0.4)