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Revenue Recognition (Contract Assets and Liabilities) (Details) - USD ($)
$ in Millions
6 Months Ended
Mar. 31, 2020
Sep. 30, 2019
Contract Assets and Liabilities    
Contract assets - current $ 84.2 $ 64.3
Contract fulfillment costs - current 84.8 64.5
Contract liabilities - current 284.1 247.4
Contract liabilities - noncurrent 51.2 $ 49.2
Revenue recognized that was previously included in current contract liabilities $ 95.0