Accumulated Other Comprehensive Income Activity (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (180.7)
OCI excluding reclassifications	(87.5)
Reclassifications to earnings	(4.1)
OCI, net of tax	(91.6)	(8.3)
Ending Balance	(272.3)
Cumulative Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(139.5)
OCI excluding reclassifications	(95.6)
Reclassifications to earnings	0
OCI, net of tax	(95.6)
Ending Balance	(235.1)
Derivative Financial Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	13.4
OCI excluding reclassifications	7.1
Reclassifications to earnings	(5.2)
OCI, net of tax	1.9
Ending Balance	15.3
Accrued Benefit Cost
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(54.6)
OCI excluding reclassifications	1.0
Reclassifications to earnings	1.1
OCI, net of tax	2.1
Ending Balance	$ (52.5)