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Debt and Credit Agreements Debt Transactions (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2018
Schedule of New Debt Issuance [Line Items]
Debt Issuance Face Amount		$ 2,000.0
3.50% Notes Due 2020
Schedule of New Debt Issuance [Line Items]
Debt Instrument, Face Amount	$ 500.0
3.75% Notes Due 2021
Schedule of New Debt Issuance [Line Items]
Debt Instrument, Face Amount	500.0
Debt instrument, unamortized discount	0.1
4.00% Notes Due 2022
Schedule of New Debt Issuance [Line Items]
Debt Instrument, Face Amount	250.0
Debt instrument, unamortized discount	0.4
3.75% Notes Due 2023
Schedule of New Debt Issuance [Line Items]
Debt Instrument, Face Amount	500.0
Debt instrument, unamortized discount	0.3
4.20% Notes Due 2024
Schedule of New Debt Issuance [Line Items]
Debt Instrument, Face Amount	500.0
Debt instrument, unamortized discount	0.3
4.65% Notes Due 2028
Schedule of New Debt Issuance [Line Items]
Debt Instrument, Face Amount	500.0
Debt instrument, unamortized discount	1.3
4.75% Note Due 2030
Schedule of New Debt Issuance [Line Items]
Debt Instrument, Face Amount	650.0
Debt instrument, unamortized discount	3.5
5.40% Notes Due 2048
Schedule of New Debt Issuance [Line Items]
Debt Instrument, Face Amount	500.0
Debt instrument, unamortized discount	2.7
Unsecured Debt 4.75% Senior Notes [Member]
Schedule of New Debt Issuance [Line Items]
Unsecured Debt	640.0
Debt instrument, unamortized discount	3.8
Debt Issuance Costs, Gross	$ 6.2

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Face (par) amount of debt instrument at time of issuance.

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