Debt (Summary of Long-Term Debt) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Current portion of long-term debt	$ 3,182.6	$ 3,182.6	$ 1,457.6
Unamortized debt issuance expense	(49.6)	(49.6)	(59.1)
Long-term debt	9,101.5	9,101.5	11,214.3
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	6.5	6.5	8.3
2020 Floating Rate Euro Notes [Domain]
Debt Instrument [Line Items]
Current portion of long-term debt	0.0	0.0	560.6
2020 Euro Senior Notes
Debt Instrument [Line Items]
Current portion of long-term debt	878.9	878.9	840.1
2020 Senior Notes (3.750% coupon)
Debt Instrument [Line Items]
Current portion of long-term debt	50.0	50.0	50.0
Other
Debt Instrument [Line Items]
Long-term debt	$ 5.5	$ 5.5	8.9
Senior Notes | 2020 Floating Rate Euro Notes [Domain]
Debt Instrument [Line Items]
Basis spread on variable rate		0.50%
Senior Notes | 2020 Euro Senior Notes
Debt Instrument [Line Items]
Stated percentage rate	1.25%	1.25%
Senior Notes | 2020 Senior Notes (3.750% coupon)
Debt Instrument [Line Items]
Stated percentage rate	3.75%	3.75%
Senior Notes | 2021 Senior Notes (3.150% coupon)
Debt Instrument [Line Items]
Stated percentage rate	3.15%	3.15%
Long-term debt	$ 2,249.6	$ 2,249.6	2,249.2
Senior Notes | 2023 Senior Notes (3.125% coupon)
Debt Instrument [Line Items]
Stated percentage rate	3.125%	3.125%
Long-term debt	$ 785.4	$ 785.4	771.8
Senior Notes | 2023 Senior Notes (4.200% coupon)
Debt Instrument [Line Items]
Stated percentage rate	4.20%	4.20%
Long-term debt	$ 499.3	$ 499.3	499.1
Senior Notes | 2024 Euro Senior Notes
Debt Instrument [Line Items]
Stated percentage rate	2.25%	2.25%
Long-term debt	$ 1,170.4	$ 1,170.4	1,119.3
Senior Notes | 2025 Euro Senior Notes [Member]
Debt Instrument [Line Items]
Stated percentage rate	2.125%	2.125%
Long-term debt	$ 585.1	$ 585.1	559.6
Senior Notes | 2026 Senior Notes (3.950% coupon)
Debt Instrument [Line Items]
Stated percentage rate	3.95%	3.95%
Long-term debt	$ 2,239.3	$ 2,239.3	2,238.1
Senior Notes | 2028 Euro Senior Notes
Debt Instrument [Line Items]
Stated percentage rate	3.125%	3.125%
Long-term debt	$ 872.7	$ 872.7	834.3
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	$ 748.5	$ 748.5	748.4
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	497.2
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	999.8
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
Current Portion of Long-Term Debt
Debt Instrument [Line Items]
Unamortized debt issuance expense	$ (2.4)	$ (2.4)	$ (1.4)