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Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Assets: |  |
Total short-term investments | $ 72.1 | $ 181.5
Total Assets | 5,081.8 | 9,240.4
Liabilities: |  |
Financial Liabilities Fair Value Disclosure | 25.5 | 50.0
Cash and Cash Equivalents [Member] |  |
Assets: |  |
Cash and cash equivalents | 4,763.3 | 8,756.3
Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 5.3 | 106.2
Equity Securities, FV-NI | 66.8 | 75.3
Total short-term investments | 72.1 | 181.5
Prepaid Expenses and Other Current Assets [Member] |  |
Assets: |  |
Derivative assets | 13.5 | 24.5
Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 222.6 | 267.7
Other Long-Term Assets [Member] |  |
Assets: |  |
Derivative assets | 10.3 | 10.4
Accrued Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities | 11.3 | 6.5
Other Long-Term Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities | 14.2 | 43.5
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Assets: |  |
Total Assets | 4,936.4 | 8,940.9
Liabilities: |  |
Financial Liabilities Fair Value Disclosure | 0.6 | 0.4
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Cash and Cash Equivalents [Member] |  |
Assets: |  |
Cash and cash equivalents | 4,763.3 | 8,756.3
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Equity Securities, FV-NI | 66.8 | 75.3
Total short-term investments | 66.8 | 75.3
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Prepaid Expenses and Other Current Assets [Member] |  |
Assets: |  |
Derivative assets | 0.1 | 1.2
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 106.2 | 108.1
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other Long-Term Assets [Member] |  |
Assets: |  |
Derivative assets | 0.0 | 0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Accrued Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities | 0.6 | 0.4
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other Long-Term Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities | 0.0 | 0.0
Significant Other Observable Inputs (Level 2) [Member] |  |
Assets: |  |
Total Assets | 139.7 | 293.6
Liabilities: |  |
Financial Liabilities Fair Value Disclosure | 24.9 | 49.6
Significant Other Observable Inputs (Level 2) [Member] | Cash and Cash Equivalents [Member] |  |
Assets: |  |
Cash and cash equivalents | 0.0 | 0.0
Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 5.3 | 106.2
Equity Securities, FV-NI | 0.0 | 0.0
Total short-term investments | 5.3 | 106.2
Significant Other Observable Inputs (Level 2) [Member] | Prepaid Expenses and Other Current Assets [Member] |  |
Assets: |  |
Derivative assets | 13.4 | 23.3
Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 110.7 | 153.7
Significant Other Observable Inputs (Level 2) [Member] | Other Long-Term Assets [Member] |  |
Assets: |  |
Derivative assets | 10.3 | 10.4
Significant Other Observable Inputs (Level 2) [Member] | Accrued Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities | 10.7 | 6.1
Significant Other Observable Inputs (Level 2) [Member] | Other Long-Term Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities | 14.2 | 43.5
Significant Unobservable Inputs (Level 3) [Member] |  |
Assets: |  |
Total Assets | 5.7 | 5.9
Liabilities: |  |
Financial Liabilities Fair Value Disclosure | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) [Member] | Cash and Cash Equivalents [Member] |  |
Assets: |  |
Cash and cash equivalents | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Equity Securities, FV-NI | 0.0 | 0.0
Total short-term investments | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) [Member] | Prepaid Expenses and Other Current Assets [Member] |  |
Assets: |  |
Derivative assets | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 5.7 | 5.9
Significant Unobservable Inputs (Level 3) [Member] | Other Long-Term Assets [Member] |  |
Assets: |  |
Derivative assets | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) [Member] | Accrued Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) [Member] | Other Long-Term Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities | 0.0 | 0.0
Agency Obligations [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale |  | 5.9
Agency Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale |  | 0.0
Agency Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale |  | 5.9
Agency Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale |  | 0.0
Commercial Paper [Member] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.2 | 8.4
Commercial Paper [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Commercial Paper [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.2 | 8.4
Commercial Paper [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Corporate Debt Securities [Member] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 4.9 | 91.8
Corporate Debt Securities [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 101.6 | 114.5
Corporate Debt Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Corporate Debt Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Corporate Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 4.9 | 91.8
Corporate Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 101.6 | 114.5
Corporate Debt Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Corporate Debt Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Foreign Government Obligations [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale |  | 3.6
Foreign Government Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale |  | 0.0
Foreign Government Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale |  | 3.6
Foreign Government Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale |  | 0.0
U.S. Government Treasury Securities [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 106.2 | 108.1
U.S. Government Treasury Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 106.2 | 108.1
U.S. Government Treasury Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
U.S. Government Treasury Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
State and Local Government Obligations [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 5.0 | 4.8
State and Local Government Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
State and Local Government Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 5.0 | 4.8
State and Local Government Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Auction Rate Securities [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 5.7 | 5.9
Auction Rate Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Auction Rate Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Auction Rate Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 5.7 | 5.9
Mortgage and Other Asset-backed Securities [Member] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.2 | 6.0
Mortgage and Other Asset-backed Securities [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 4.1 | 24.9
Mortgage and Other Asset-backed Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Mortgage and Other Asset-backed Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Mortgage and Other Asset-backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.2 | 6.0
Mortgage and Other Asset-backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 4.1 | 24.9
Mortgage and Other Asset-backed Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Mortgage and Other Asset-backed Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | $ 0.0 | $ 0.0

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