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Debt and Credit Agreements Debt Transactions (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2018
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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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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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