Reclassification out of AOCI (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Gains/(losses) on foreign currency translation adjustments
Liquidation of foreign subsidiary	$ 0.1	$ (4.4)	$ (1.4)
Total gains/(losses) on foreign translation adjustments	0.1	(4.4)	(1.4)
Cash flow and net investment hedges, net of tax:
Losses included cash flow hedges - Pre Tax			(1.2)
Losses included cash flow hedges - Tax			0.5
Losses included cash flow hedges - Net of Tax			(0.7)
Gains on available for sale securities:
Gains on available for sale securities	0.9	0.1
Pension and other retirement benefits, net of tax:
Amortization of actuarial losses and prior service costs included in net income - Pre Tax	(13.5)	(7.3)	(11.9)
Amortization of actuarial losses and prior service costs included in net income - Tax	5.2	2.8	4.9
Amortization of actuarial losses and prior service costs included in net income - Net of Tax	(8.3)	(4.5)	(7.0)
Income (loss) attributable to reclassification out of AOCI - Net of Tax	(7.3)	(8.8)	(9.1)
Other Nonoperating Income [Member]
Gains/(losses) on foreign currency translation adjustments
Liquidation of foreign subsidiary	0.1		(1.4)
ICRA Gain [Member]
Gains/(losses) on foreign currency translation adjustments
Foreign currency translation adjustment reclassification of losses to net income pursuant to ICRA Step Acquisition		(4.4)
Other Income [Member]
Gains on available for sale securities:
Gains on available for sale securities	0.9	0.1
Operating Expense [Member]
Pension and other retirement benefits, net of tax:
Amortization of actuarial losses and prior service costs included in net income - Pre Tax	(8.5)	(4.7)	(7.6)
SG&A Expenses [Member]
Pension and other retirement benefits, net of tax:
Amortization of actuarial losses and prior service costs included in net income - Pre Tax	$ (5.0)	$ (2.6)	(4.3)
Cash Flow Hedging [Member] | Interest Rate Swap [Member]
Cash flow and net investment hedges, net of tax:
Losses included cash flow hedges - Tax			0.5
Losses included cash flow hedges - Net of Tax			(0.7)
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Interest Income (Expense), Net [Member]
Cash flow and net investment hedges, net of tax:
Losses included cash flow hedges - Pre Tax			$ (1.2)