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New Accounting Standards - Schedule of Effect of New Leasing Guidance to Condensed Consolidated Financial Statements (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Oct. 01, 2019 | Sep. 30, 2019
--- | --- | --- | ---
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Other current assets | $ 93.9 |  | $ 78.9
Total current assets | 3,533.6 |  | 3,408.3
Other long-term assets | 356.8 |  | 156.4
Total assets | 5,861.9 |  | 5,566.3
Other current liabilities | 332.1 |  | 307.3
Total current liabilities | 1,805.0 |  | 1,741.9
Other long-term liabilities | 550.5 |  | 405.6
Total liabilities and shareholders' equity | $ 5,861.9 |  | $ 5,566.3
Accounting Standards Update 2016-02 |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Other current assets |  | $ 78.4 |
Total current assets |  | 3,407.8 |
Other long-term assets |  | 335.9 |
Total assets |  | 5,745.3 |
Other current liabilities |  | 353.7 |
Total current liabilities |  | 1,788.3 |
Other long-term liabilities |  | 538.2 |
Total liabilities and shareholders' equity |  | 5,745.3 |
Accounting Standards Update 2016-02 | Impact of New Lease Standard |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Other current assets |  | (0.5) |
Total current assets |  | (0.5) |
Other long-term assets |  | 179.5 |
Total assets |  | 179.0 |
Other current liabilities |  | 46.4 |
Total current liabilities |  | 46.4 |
Other long-term liabilities |  | 132.6 |
Total liabilities and shareholders' equity |  | $ 179.0 |

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