Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 11,384.4
Total other comprehensive income (loss), net of tax	96.1	$ (40.4)
Ending balance	12,029.8
Cumulative Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(607.9)
Other comprehensive (loss) income before reclassifications	49.9
Amounts reclassified to earnings	56.1
Total other comprehensive income (loss), net of tax	106.0
Ending balance	(501.9)
Pension and Postretirement Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(400.0)
Other comprehensive (loss) income before reclassifications	(2.1)
Amounts reclassified to earnings	2.9
Total other comprehensive income (loss), net of tax	0.8
Ending balance	(399.2)
Derivative Financial Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(36.9)
Other comprehensive (loss) income before reclassifications	(10.9)
Amounts reclassified to earnings	0.2
Total other comprehensive income (loss), net of tax	(10.7)
Ending balance	(47.6)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,044.8)
Other comprehensive (loss) income before reclassifications	36.9
Amounts reclassified to earnings	59.2
Total other comprehensive income (loss), net of tax	96.1
Ending balance	$ (948.7)