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Debt and Credit Agreements Debt Transactions (Details) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019
Schedule of New Debt Issuance [Line Items] |  |  |
Repayments of Debt | $ 100.0 | $ 200.0 | $ 100.0
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 |  |
4.65% Notes Due 2028 |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |
Debt Instrument, Face Amount | 500.0 |  |
5.40% Notes Due 2048 |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |
Debt Instrument, Face Amount | $ 500.0 |  |

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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=114775744&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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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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