Debt (Summary of Long-Term Debt) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Current portion of long-term debt	$ 2,255.3	$ 2,256.3
Unamortized debt issuance expense	(46.3)	(47.8)
Long-term debt	22,102.2	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	6.0	8.0
Other
Debt Instrument [Line Items]
Long-term debt	$ 2.3	17.4
Senior Notes 2021
Debt Instrument [Line Items]
Stated percentage rate	3.15%
Current portion of long-term debt	$ 2,249.9	2,249.7
2022 Euro Senior Notes
Debt Instrument [Line Items]
Stated percentage rate	0.816%
Long-term debt	$ 889.8	928.8
Senior Notes 2022
Debt Instrument [Line Items]
Stated percentage rate	1.125%
Long-term debt	$ 1,007.3	1,008.8
2024 Euro Senior Notes, 1.023%
Debt Instrument [Line Items]
Stated percentage rate	1.023%
2027 Euro Senior Notes
Debt Instrument [Line Items]
Stated percentage rate	1.362%
2027 Senior Notes
Debt Instrument [Line Items]
Stated percentage rate	2.30%
Term Loan
Debt Instrument [Line Items]
Long-term debt	$ 600.0	600.0
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%
Long-term debt	$ 777.7	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%
Long-term debt	$ 499.4	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%
Long-term debt	$ 1,171.5	1,219.9
Senior Notes \| 2.125% Euro Senior Notes due 2025
Debt Instrument [Line Items]
Stated percentage rate	2.125%
Long-term debt	$ 585.7	609.9
Senior Notes \| 2026 Senior Notes (3.950% coupon)
Debt Instrument [Line Items]
Stated percentage rate	3.95%
Long-term debt	$ 2,240.1	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%
Long-term debt	$ 873.7	909.7
Senior Notes \| SeniorNotesTwoThousandTwentyEight [Member]
Debt Instrument [Line Items]
Stated percentage rate	4.55%
Senior Notes \| 2028 Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt	$ 748.6	748.6
Senior Notes \| 2043 Senior Notes (5.400% coupon)
Debt Instrument [Line Items]
Stated percentage rate	5.40%
Long-term debt	$ 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%
Long-term debt	$ 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%
Senior Notes \| 2048 Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt	$ 747.7	747.7
Senior Notes \| 2024 Euro Senior Notes, 1.023%
Debt Instrument [Line Items]
Long-term debt	$ 905.1	944.6
Senior Notes \| 2025 Senior Notes
Debt Instrument [Line Items]
Stated percentage rate	1.65%
Long-term debt	$ 766.2	767.1
Senior Notes \| 2027 Euro Senior Notes
Debt Instrument [Line Items]
Long-term debt	1,051.6	1,097.4
Senior Notes \| 2027 Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 784.8	786.1
Senior Notes \| 2030 Senior Notes
Debt Instrument [Line Items]
Stated percentage rate	2.70%
Long-term debt	$ 1,526.2	1,528.0
Senior Notes \| 2032 Euro Senior Notes
Debt Instrument [Line Items]
Stated percentage rate	1.908%
Long-term debt	$ 1,603.5	1,672.6
Senior Notes \| 2040 Senior Notes
Debt Instrument [Line Items]
Stated percentage rate	3.85%
Long-term debt	$ 1,661.8	1,663.3
Senior Notes \| 2050 Senior Notes
Debt Instrument [Line Items]
Stated percentage rate	4.00%
Long-term debt	$ 2,208.3	2,209.3
Current Portion of Long-Term Debt
Debt Instrument [Line Items]
Unamortized debt issuance expense	$ (0.6)	$ (1.4)

Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Cash received from sale of investments in debt and equity securities, classified as operating activities, during the period; includes trading securities and any other investments classified as operating.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Percentage price equivalent at which long-term debt principal amount is redeemable prior to a specified date.

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