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Debt - Summary of Debt (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Senior notes	$ 657.2
Other debt	58.8	$ 48.4
Debt
Total debt	6,751.2	7,015.0
Short-term debt and current portion of long-term debt	(43.4)	(318.7)
Long-term debt	6,707.8	6,696.3
2.60% senior notes due 2019
Debt Instrument [Line Items]
Senior notes	0.0	267.3
4.70% senior notes due 2020
Debt Instrument [Line Items]
Senior notes	304.7	304.6
3.15% senior notes due 2021
Debt Instrument [Line Items]
Senior notes	93.5	97.5
3.75% senior notes due 2021
Debt Instrument [Line Items]
Senior notes	348.5	353.2
4.00% senior notes due 2022
Debt Instrument [Line Items]
Senior notes	249.2	249.0
3.85% senior notes due 2023
Debt Instrument [Line Items]
Senior notes	1,741.8	1,740.8
5.00% senior notes due 2023
Debt Instrument [Line Items]
Senior notes	309.0	310.0
4.00% senior notes due 2024
Debt Instrument [Line Items]
Senior notes	496.7	496.4
3.90% senior notes due 2025
Debt Instrument [Line Items]
Senior notes	90.4	90.3
4.20% senior notes due 2026
Debt Instrument [Line Items]
Senior notes	1,985.4	1,984.5
5.375% senior notes due 2036
Debt Instrument [Line Items]
Senior notes		415.8
5.50% senior notes due 2046
Debt Instrument [Line Items]
Senior notes	$ 416.0	$ 657.2

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