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Debt - Summary of Outstanding Debt (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Commercial paper	$ 0.0	$ 0.0
Receivables facility	298.3	187.4
Other debt	72.0	73.3
Total debt	10,552.4	11,892.8
Debt
Total debt	10,552.4	11,892.8
Short-term debt and current portion of long-term debt	(662.8)	(601.9)
Long-term debt	9,889.6	11,290.9
2.05% Senior Notes Due 2017 [Member]
Debt Instrument [Line Items]
Total Debt		349.4
6.25% Senior Notes Due 2018 [Member]
Debt Instrument [Line Items]
Total Debt		249.8
2.15% Senior Notes Due 2018 [Member]
Debt Instrument [Line Items]
Total Debt	299.5	298.9
2.60% Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Total Debt	266.7	995.0
2.875% Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Total Debt	348.6	347.9
4.70% Senior Notes Due 2020 [Member]
Debt Instrument [Line Items]
Total Debt	304.3	380.0
3.15% Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Total Debt	993.6	991.7
3.75% Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Total Debt	373.2	326.9
4.00% Senior Notes Due 2022 [Member]
Debt Instrument [Line Items]
Total Debt	248.8	248.5
3.85% Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Total Debt	1,738.8	1,737.0
5.00% Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Total Debt	312.1	314.1
4.00% Senior Notes Due 2024 [Member]
Debt Instrument [Line Items]
Total Debt	495.8	495.2
3.90% Senior Notes Due 2025 [Member]
Debt Instrument [Line Items]
Total Debt	297.2	296.8
4.20% Senior Notes Due 2026 [Member]
Debt Instrument [Line Items]
Total Debt	1,982.7	1,981.0
5.375% Senior Notes Due 2036 [Member]
Debt Instrument [Line Items]
Total Debt	495.0	494.7
5.50% Senior Notes Due 2046 [Member]
Debt Instrument [Line Items]
Total Debt	1,726.0	1,725.7
Term Loan [Member]
Debt Instrument [Line Items]
Total Debt	$ 299.8	$ 399.5

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Secured financing facility where underlying trade receivables are not accounted for as "sale" under ASC 860 with initial maturity date of the financing facility being 364 days.

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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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