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Long-Term Debt - Long-Term Debt (Detail) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Total debt | $ 5,044.3 | $ 5,100.9
Less: Current maturities | 0.0 | (0.1)
Long-term debt | 5,044.3 | 5,100.8
0.650% Senior Notes, Due 2023 |  |
Debt Instrument [Line Items] |  |
Total debt | 698.3 | 697.4
4.25% Senior Notes, Due 2024 |  |
Debt Instrument [Line Items] |  |
Total debt | 398.6 | 398.3
7% Debentures, Due 2025 |  |
Debt Instrument [Line Items] |  |
Total debt | 124.6 | 124.6
3.450% Senior Notes, Due 2027 |  |
Debt Instrument [Line Items] |  |
Total debt | 298.1 | 297.9
3.500% Senior Notes, Due 2027 |  |
Debt Instrument [Line Items] |  |
Total debt | 496.7 | 496.4
2.500% Senior Notes, Due 2030 |  |
Debt Instrument [Line Items] |  |
Total debt | 471.8 | 491.1
2.400% Senior Notes, Due 2031 |  |
Debt Instrument [Line Items] |  |
Total debt | 888.2 | 891.8
6.25% Senior Notes, Due 2037 |  |
Debt Instrument [Line Items] |  |
Total debt | 228.3 | 228.3
4.250% Senior Notes, Due 2047 |  |
Debt Instrument [Line Items] |  |
Total debt | 590.1 | 592.1
3.200% Senior Notes, Due 2051 |  |
Debt Instrument [Line Items] |  |
Total debt | 849.6 | 882.9
Other Notes |  |
Debt Instrument [Line Items] |  |
Total debt | $ 0.0 | $ 0.1

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