Debt - Summary of Debt Instruments (Detail) € in Millions, $ in Millions, ¥ in Billions	Dec. 31, 2019 USD ($)	Dec. 31, 2019 JPY (¥)	Nov. 15, 2019 EUR (€)	Dec. 31, 2018 USD ($)	Mar. 19, 2018 USD ($)
Current portion of long-term debt
Total current portion of long-term debt	$ 1,500.0			$ 525.0
Long-term debt
Senior Notes due	8,000.0
Debt discount and issuance costs	(37.1)			(42.7)
Adjustment related to interest rate swaps	6.4			14.6
Total long-term debt	6,721.4			8,413.7
Senior Notes [Member]
Long-term debt
Senior Notes due					$ 300.0
Senior Notes [Member] | 4.625% [Member] | Due in 2019 [Member]
Current portion of long-term debt
Total current portion of long-term debt				500.0
Senior Notes [Member] | 2.700% [Member] | Due in 2020 [Member]
Current portion of long-term debt
Total current portion of long-term debt	1,500.0
Long-term debt
Senior Notes due				1,500.0
Senior Notes [Member] | 3.375% [Member] | Due in 2021 [Member]
Long-term debt
Senior Notes due	300.0			300.0
Senior Notes [Member] | 3.150% [Member] | Due in 2022 [Member]
Long-term debt
Senior Notes due	750.0			750.0
Senior Notes [Member] | 3.700% [Member] | Due in 2023 [Member]
Long-term debt
Senior Notes due	300.0			300.0
Senior Notes [Member] | 3.550% [Member] | Due in 2025 [Member]
Long-term debt
Senior Notes due	2,000.0			2,000.0
Senior Notes [Member] | 4.250% [Member] | Due in 2035 [Member]
Long-term debt
Senior Notes due	253.4			253.4
Senior Notes [Member] | 5.750% [Member] | Due in 2039 [Member]
Long-term debt
Senior Notes due	317.8			317.8
Senior Notes [Member] | 4.450% [Member] | Due in 2045 [Member]
Long-term debt
Senior Notes due	395.4			395.4
U.S. Term Loan B [Member]
Current portion of long-term debt
Total current portion of long-term debt				25.0
Long-term debt
Term loan				200.0
Floating Rate Notes [Member]
Long-term debt
Senior Notes due					$ 450.0
Floating Rate Notes [Member] | Due in 2021 [Member]
Long-term debt
Senior Notes due	450.0			450.0
Euro Notes [Member]
Long-term debt
Term loan	1,700.0
Euro Notes [Member] | 1.414% [Member] | Due in 2022 [Member]
Long-term debt
Term loan	561.3			571.6
Euro Notes [Member] | 2.425% [Member] | Due in 2026 [Member]
Long-term debt
Term loan	561.3			571.6
Euro Notes [Member] | 1.164% [Member] | Due in 2027 [Member]
Long-term debt
Senior Notes due | €			€ 500
Term loan	561.3
U.S. Term Loan C [Member]
Long-term debt
Term loan				535.0
Japan Term Loan A [Member]
Long-term debt
Term loan	106.9	¥ 11.7		105.3
Japan Term Loan B [Member]
Long-term debt
Term loan	$ 194.7	¥ 21.3		$ 191.7