Long-Term Debt - Long-Term Debt (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Total debt	$ 4,345.2	$ 5,040.0
Less: current maturities	(399.6)	(699.1)
Long-term debt	3,945.6	4,340.9
0.650% Senior Notes, Due 2023
Debt Instrument [Line Items]
Total debt	0.0	699.1
4.250% Senior Notes, Due 2024
Debt Instrument [Line Items]
Total debt	399.6	398.9
7% Debentures, Due 2025
Debt Instrument [Line Items]
Total debt	124.8	124.7
3.450% Senior Notes, Due 2027
Debt Instrument [Line Items]
Total debt	298.7	298.3
3.500% Senior Notes, Due 2027
Debt Instrument [Line Items]
Total debt	492.2	491.5
2.500% Senior Notes, Due 2030
Debt Instrument [Line Items]
Total debt	471.5	470.5
2.400% Senior Notes, Due 2031
Debt Instrument [Line Items]
Total debt	889.4	888.6
6.25% Senior Notes, Due 2037
Debt Instrument [Line Items]
Total debt	228.4	228.4
4.250% Senior Notes, Due 2047
Debt Instrument [Line Items]
Total debt	590.4	590.2
3.200% Senior Notes, Due 2051
Debt Instrument [Line Items]
Total debt	$ 850.2	$ 849.8