Accumulated Other Comprehensive Income - Changes in Components of Accumulated Other Comprehensive Income, Net of Tax (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($)
Other Comprehensive Income Loss [Line Items]
Stockholders Equity, Beginning Balance	$ 12,388.1
AOCI before reclassifications	(14.0)
Reclassifications to statements of earnings	(31.1)
Stockholders Equity, Ending Balance	11,872.2
Cash Flow Hedges [Member]
Other Comprehensive Income Loss [Line Items]
Stockholders Equity, Beginning Balance	16.4
AOCI before reclassifications	8.7
Reclassifications to statements of earnings	(33.6)
Stockholders Equity, Ending Balance	(8.5)
Foreign Currency Translation [Member]
Other Comprehensive Income Loss [Line Items]
Stockholders Equity, Beginning Balance	(32.8)
AOCI before reclassifications	(22.7)
Stockholders Equity, Ending Balance	(55.5)
Defined Benefit Plan Items [Member]
Other Comprehensive Income Loss [Line Items]
Stockholders Equity, Beginning Balance	(225.5)
Reclassifications to statements of earnings	2.5
Stockholders Equity, Ending Balance	(223.0)
Total AOCI [Member]
Other Comprehensive Income Loss [Line Items]
Stockholders Equity, Beginning Balance	(241.9)
Stockholders Equity, Ending Balance	$ (287.0)