Debt - Summary of Debt Instruments (Detail) € in Millions, $ in Millions, ¥ in Billions	Dec. 31, 2020 USD ($)	Dec. 31, 2020 EUR (€)	Dec. 31, 2020 JPY (¥)	Mar. 20, 2020 USD ($)	Dec. 31, 2019 USD ($)	Nov. 15, 2019 EUR (€)	Mar. 19, 2018 USD ($)
Current portion of long-term debt
Total current portion of long-term debt	$ 500.0				$ 1,500.0
Long-term debt
Senior Notes due	7,800.0
Debt discount and issuance costs	(48.2)				(37.1)
Adjustment related to interest rate swaps	3.1				6.4
Total long-term debt	7,626.5				6,721.4
Senior Notes [Member]
Long-term debt
Senior Notes due							$ 300.0
Senior Notes [Member] | Due in 2021 [Member]
Long-term debt
Senior Notes due							450.0
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
Senior Notes [Member] | 3.150% [Member] | Due in 2022 [Member]
Long-term debt
Senior Notes due	750.0				750.0
Senior Notes [Member] | 3.375% [Member] | Due in 2021 [Member]
Current portion of long-term debt
Total current portion of long-term debt	300.0
Long-term debt
Senior Notes due					300.0
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] | 3.550% [Member] | Due in 2030 [Member]
Long-term debt
Senior Notes due	900.0			$ 900.0
Senior Notes [Member] | 3.050% [Member] | Due in 2026 [Member]
Long-term debt
Senior Notes due	600.0			$ 600.0
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
Floating Rate Notes [Member]
Long-term debt
Senior Notes due							$ 450.0
Floating Rate Notes [Member] | Due in 2021 [Member]
Current portion of long-term debt
Total current portion of long-term debt	200.0
Long-term debt
Senior Notes due					450.0
Euro Notes [Member]
Long-term debt
Term loan | €		€ 1,500
Euro Notes [Member] | 1.414% [Member] | Due in 2022 [Member]
Long-term debt
Term loan	611.8				561.3
Euro Notes [Member] | 2.425% [Member] | Due in 2026 [Member]
Long-term debt
Term loan	611.8				561.3
Euro Notes [Member] | 1.164% [Member] | Due in 2027 [Member]
Long-term debt
Senior Notes due | €						€ 500
Term loan	611.8				561.3
Japan Term Loan A [Member]
Long-term debt
Term loan	113.3		¥ 11.7		106.9
Japan Term Loan B [Member]
Long-term debt
Term loan	$ 206.3		¥ 21.3		$ 194.7