Debt (Summary of Long-Term Debt) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Current portion of long-term debt	$ 1,881.0	$ 1,881.0	$ 2,256.3
Unamortized debt issuance expense	(43.7)	(43.7)	(47.8)
Long-term debt	19,854.3	19,854.3	22,429.2
Proceeds from sale of terminated interest rate swaps	45.0
Other Current Portion of Long-term Debt
Debt Instrument [Line Items]
Current portion of long-term debt	2.3	2.3	8.0
Other
Debt Instrument [Line Items]
Long-term debt	$ 1.7	$ 1.7	17.4
Senior Notes 2021
Debt Instrument [Line Items]
Stated percentage rate	3.15%	3.15%
Current portion of long-term debt	$ 0.0	$ 0.0	2,249.7
2022 Euro Senior Notes
Debt Instrument [Line Items]
Stated percentage rate	0.816%	0.816%
Current portion of long-term debt	$ 874.4	$ 874.4	0.0
Long-term debt	$ 0.0	$ 0.0	928.8
Senior Notes 2022
Debt Instrument [Line Items]
Stated percentage rate	1.125%	1.125%
Current portion of long-term debt	$ 1,004.4	$ 1,004.4	0.0
Long-term debt	$ 0.0	$ 0.0	1,008.8
2024 Euro Senior Notes, 1.023%
Debt Instrument [Line Items]
Stated percentage rate	1.023%	1.023%
2027 Euro Senior Notes
Debt Instrument [Line Items]
Stated percentage rate	1.362%	1.362%
2027 Senior Notes
Debt Instrument [Line Items]
Stated percentage rate	2.30%	2.30%
Term Loan
Debt Instrument [Line Items]
Long-term debt	$ 0.0	$ 0.0	600.0
YEN Term Loan
Debt Instrument [Line Items]
Long-term debt	$ 359.4	$ 359.4	0.0
Senior Notes | 2018 Senior Notes (2.600% coupon)
Debt Instrument [Line Items]
Equivalent percentage of redeemed amount		100.00%
Basis spread on variable rate		0.30%
Senior Notes | 2018 Senior Notes (3.000% coupon)
Debt Instrument [Line Items]
Equivalent percentage of redeemed amount		100.00%
Basis spread on variable rate		0.30%
Senior Notes | 2019 Senior Notes (2.500% coupon)
Debt Instrument [Line Items]
Equivalent percentage of redeemed amount		100.00%
Basis spread on variable rate		0.25%
Senior Notes | 2019 Senior Notes (2.550% coupon)
Debt Instrument [Line Items]
Equivalent percentage of redeemed amount		100.00%
Basis spread on variable rate		0.20%
Senior Notes | 2020 Senior Notes (3.750% coupon)
Debt Instrument [Line Items]
Equivalent percentage of redeemed amount		100.00%
Basis spread on variable rate		0.35%
Senior Notes | 2021 Senior Notes (3.150% coupon)
Debt Instrument [Line Items]
Equivalent percentage of redeemed amount		100.00%
Basis spread on variable rate		0.30%
Senior Notes | 2023 Senior Notes (3.125% coupon)
Debt Instrument [Line Items]
Stated percentage rate	3.125%	3.125%
Long-term debt	$ 770.0	$ 770.0	781.6
Equivalent percentage of redeemed amount		100.00%
Basis spread on variable rate		0.20%
Senior Notes | 2023 Senior Notes (4.200% coupon)
Debt Instrument [Line Items]
Stated percentage rate	4.20%	4.20%
Long-term debt	$ 499.5	$ 499.5	499.3
Equivalent percentage of redeemed amount		100.00%
Basis spread on variable rate		0.25%
Senior Notes | 2024 Euro Senior Notes
Debt Instrument [Line Items]
Stated percentage rate	2.25%	2.25%
Long-term debt	$ 1,156.7	$ 1,156.7	1,219.9
Senior Notes | 2.125% Euro Senior Notes due 2025
Debt Instrument [Line Items]
Stated percentage rate	2.125%	2.125%
Long-term debt	$ 578.3	$ 578.3	609.9
Senior Notes | 2026 Senior Notes (3.950% coupon)
Debt Instrument [Line Items]
Stated percentage rate	3.95%	3.95%
Long-term debt	$ 2,241.0	$ 2,241.0	2,239.7
Equivalent percentage of redeemed amount		100.00%
Basis spread on variable rate		0.35%
Senior Notes | 2028 Euro Senior Notes
Debt Instrument [Line Items]
Stated percentage rate	3.125%	3.125%
Long-term debt	$ 862.9	$ 862.9	909.7
Senior Notes | SeniorNotesTwoThousandTwentyEight [Member]
Debt Instrument [Line Items]
Stated percentage rate	4.55%	4.55%
Senior Notes | 2028 Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt	$ 748.7	$ 748.7	748.6
Senior Notes | 2043 Senior Notes (5.400% coupon)
Debt Instrument [Line Items]
Stated percentage rate	5.40%	5.40%
Long-term debt	$ 497.3	$ 497.3	497.3
Equivalent percentage of redeemed amount		100.00%
Basis spread on variable rate		0.25%
Senior Notes | 2046 Senior Notes (5.250% coupon)
Debt Instrument [Line Items]
Stated percentage rate	5.25%	5.25%
Long-term debt	$ 999.9	$ 999.9	999.9
Equivalent percentage of redeemed amount		100.00%
Basis spread on variable rate		0.40%
Senior Notes | 2048 Senior Notes (5.200%)
Debt Instrument [Line Items]
Stated percentage rate	5.20%	5.20%
Senior Notes | 2048 Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt	$ 747.7	$ 747.7	747.7
Senior Notes | 2024 Euro Senior Notes, 1.023%
Debt Instrument [Line Items]
Long-term debt	$ 889.6	$ 889.6	944.6
Senior Notes | 2025 Senior Notes
Debt Instrument [Line Items]
Stated percentage rate	1.65%	1.65%
Long-term debt	$ 764.3	$ 764.3	767.1
Senior Notes | 2027 Euro Senior Notes
Debt Instrument [Line Items]
Long-term debt	1,033.9	1,033.9	1,097.4
Senior Notes | 2027 Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 782.1	$ 782.1	786.1
Senior Notes | 2030 Senior Notes
Debt Instrument [Line Items]
Stated percentage rate	2.70%	2.70%
Long-term debt	$ 1,522.4	$ 1,522.4	1,528.0
Senior Notes | 2032 Euro Senior Notes
Debt Instrument [Line Items]
Stated percentage rate	1.908%	1.908%
Long-term debt	$ 1,577.7	$ 1,577.7	1,672.6
Senior Notes | 2040 Senior Notes
Debt Instrument [Line Items]
Stated percentage rate	3.85%	3.85%
Long-term debt	$ 1,658.7	$ 1,658.7	1,663.3
Senior Notes | 2050 Senior Notes
Debt Instrument [Line Items]
Stated percentage rate	4.00%	4.00%
Long-term debt	$ 2,206.2	$ 2,206.2	2,209.3
Current Portion of Long-Term Debt
Debt Instrument [Line Items]
Unamortized debt issuance expense	$ (0.1)	$ (0.1)	$ (1.4)