Changes in Components of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Beginning Balance	$ (339.5)	$ (235.2)
Net unrealized gain (losses) on cash flow - Net of Tax	1.2
Reclassification gain (losses) on cash flow - Net of Tax	(1.4)
Gains/(Losses) on cash flow hedges - Net of Tax	(0.2)
Reclassification adjustment from AOCI, Pension and Other Postretirement Benefit Plans - Net of Tax	1.6	2.3
Pension and other retirement benefit - Net of Tax	1.6	2.3
Foreign currency translation adjustments before reclassification - Net of Tax	36.0	(90.5)
Amount reclassified from AOCI, Foreign Currency Translation Adjustment - Net of Tax		(0.1)
Foreign currency translation adjustments - Net of Tax	36.0	(90.6)
Available for sale securities before reclassification - Net of Tax	0.6	1.1
Gains on Available for sale securities - Net of Tax	0.6	1.1
Other comprehensive income/(loss) before reclassifications	37.8	(89.4)
Amounts reclassified from AOCI	0.2	2.2
Total other comprehensive income (loss) - Net of Tax	38.0	(87.2)
Ending Balance	(301.5)	(322.4)
Gains Losses On Net Investment Hedges [Member]
Beginning Balance	(1.1)
Ending Balance	(1.3)
Pension and Other Retirement Benefits [Member]
Beginning Balance	(85.7)	(105.4)
Ending Balance	(84.1)	(103.1)
Foreign Currency Translation Adjustments [Member]
Beginning Balance	(256.0)	(130.7)
Ending Balance	(220.0)	(221.3)
Gains on Available for Sale Securities [Member]
Beginning Balance	3.3	0.9
Ending Balance	$ 3.9	$ 2.0