Reclassification out of AOCI (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Gains/(losses) on foreign currency translation adjustments
Liquidation of foreign subsidiary	$ 36.6	$ 0.1	$ (4.4)
Total gain in Foreign currency translation adjustments	36.6	0.1	(4.4)
Cash flow and net investment hedges, net of tax:
Losses included cash flow hedges - Pre Tax	(6.0)
Losses included cash flow hedges - Tax	2.3
Losses included cash flow hedges - Net of Tax	(3.7)
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	(9.7)	(13.5)	(7.3)
Amortization of actuarial losses and prior service costs included in net income - Tax	3.7	5.2	2.8
Amortization of actuarial losses and prior service costs included in net income - Net of Tax	(6.0)	(8.3)	(4.5)
Income (loss) attributable to reclassification out of AOCI - Net of Tax	(26.9)	(7.3)	(8.8)
Other Nonoperating Income (Expense) [Member]
Gains/(losses) on foreign currency translation adjustments
Liquidation of foreign subsidiary	36.6	0.1
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	(5.8)	(8.5)	(4.7)
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	(3.9)	$ (5.0)	(2.6)
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)
Cash Flow Hedging [Member] | Currency Swap [Member] | Other Nonoperating Income (Expense) [Member]
Cash flow and net investment hedges, net of tax:
Losses included cash flow hedges - Pre Tax	$ (6.0)