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Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Sep. 30, 2018
--- | --- | ---
Assets: |  |
Total short-term investments | $ 76.6 | $ 181.5
Total Assets | 2,414.3 | 9,240.4
Liabilities: |  |
Financial Liabilities Fair Value Disclosure | 56.3 | 50.0
Cash and Cash Equivalents [Member] |  |
Assets: |  |
Cash and cash equivalents | 2,055.1 | 8,756.3
Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 12.0 | 106.2
Equity Securities, FV-NI | 64.6 | 75.3
Total short-term investments | 76.6 | 181.5
Prepaid Expenses and Other Current Assets [Member] |  |
Assets: |  |
Derivative assets | 19.9 | 24.5
Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 251.9 | 267.7
Other Long-Term Assets [Member] |  |
Assets: |  |
Derivative assets | 10.8 | 10.4
Accrued Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities | 11.8 | 6.5
Other Long-Term Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities | 44.5 | 43.5
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Assets: |  |
Total Assets | 2,229.6 | 8,940.9
Liabilities: |  |
Financial Liabilities Fair Value Disclosure | 1.4 | 0.4
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Cash and Cash Equivalents [Member] |  |
Assets: |  |
Cash and cash equivalents | 2,055.1 | 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 | 64.6 | 75.3
Total short-term investments | 64.6 | 75.3
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Prepaid Expenses and Other Current Assets [Member] |  |
Assets: |  |
Derivative assets | 0.2 | 1.2
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 109.7 | 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 | 1.4 | 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 | 179.0 | 293.6
Liabilities: |  |
Financial Liabilities Fair Value Disclosure | 54.9 | 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 | 12.0 | 106.2
Equity Securities, FV-NI | 0.0 | 0.0
Total short-term investments | 12.0 | 106.2
Significant Other Observable Inputs (Level 2) [Member] | Prepaid Expenses and Other Current Assets [Member] |  |
Assets: |  |
Derivative assets | 19.7 | 23.3
Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 136.5 | 153.7
Significant Other Observable Inputs (Level 2) [Member] | Other Long-Term Assets [Member] |  |
Assets: |  |
Derivative assets | 10.8 | 10.4
Significant Other Observable Inputs (Level 2) [Member] | Accrued Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities | 10.4 | 6.1
Significant Other Observable Inputs (Level 2) [Member] | Other Long-Term Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities | 44.5 | 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 | 6.0 | 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 | 0.0
Agency Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 6.0 | 5.9
Agency Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 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 | 4.8 | 91.8
Corporate Debt Securities [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 119.0 | 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 | 4.8 | 91.8
Corporate Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 119.0 | 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] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 3.7 |
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] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 |
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] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 3.7 |
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] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 |
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 | 109.7 | 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 | 109.7 | 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 | 4.9 | 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 | 4.9 | 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 | 3.3 | 6.0
Mortgage and Other Asset-backed Securities [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 6.6 | 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 | 3.3 | 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 | 6.6 | 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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