Accumulated Other Comprehensive Income - Changes in Components of Accumulated Other Comprehensive Income, Net of Tax (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Other Comprehensive Income Loss [Line Items]
Stockholders Equity, Beginning Balance	$ 11,271.3
AOCI before reclassifications	(19.1)
Reclassifications to statement of earnings	(16.7)
Stockholders Equity, Ending Balance	12,081.5
Cash Flow Hedges [Member]
Other Comprehensive Income Loss [Line Items]
Stockholders Equity, Beginning Balance	20.9
AOCI before reclassifications	41.0
Reclassifications to statement of earnings	(24.1)
Stockholders Equity, Ending Balance	37.8
Foreign Currency Translation [Member]
Other Comprehensive Income Loss [Line Items]
Stockholders Equity, Beginning Balance	(31.3)
AOCI before reclassifications	(60.1)
Stockholders Equity, Ending Balance	(91.4)
Defined Benefit Plan Items [Member]
Other Comprehensive Income Loss [Line Items]
Stockholders Equity, Beginning Balance	(177.0)
Reclassifications to statement of earnings	7.4
Stockholders Equity, Ending Balance	(169.6)
Total AOCI [Member]
Other Comprehensive Income Loss [Line Items]
Stockholders Equity, Beginning Balance	(187.4)
Stockholders Equity, Ending Balance	$ (223.2)