Accumulated Other Comprehensive Income - Changes in Components of Accumulated Other Comprehensive Income, Net of Tax (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2020 USD ($)
Other Comprehensive Income Loss [Line Items]
Stockholders Equity, Beginning Balance	$ 12,388.1
AOCI before reclassifications	0.9
Reclassifications to statements of earnings	(24.8)
Stockholders Equity, Ending Balance	11,641.4
Cash Flow Hedges [Member]
Other Comprehensive Income Loss [Line Items]
Stockholders Equity, Beginning Balance	16.4
AOCI before reclassifications	32.1
Reclassifications to statements of earnings	(26.6)
Stockholders Equity, Ending Balance	21.9
Foreign Currency Translation [Member]
Other Comprehensive Income Loss [Line Items]
Stockholders Equity, Beginning Balance	(32.8)
AOCI before reclassifications	(31.2)
Stockholders Equity, Ending Balance	(64.0)
Defined Benefit Plan Items [Member]
Other Comprehensive Income Loss [Line Items]
Stockholders Equity, Beginning Balance	(225.5)
Reclassifications to statements of earnings	1.8
Stockholders Equity, Ending Balance	(223.7)
Total AOCI [Member]
Other Comprehensive Income Loss [Line Items]
Stockholders Equity, Beginning Balance	(241.9)
Stockholders Equity, Ending Balance	$ (265.8)