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Revenue Recognition (Contract Assets and Liabilities) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Revenue from Contract with Customer [Abstract]    
Contract assets - current $ 55.9 $ 64.3
Contract fulfillment costs - current 109.9 64.5
Contract liabilities - current 313.8 247.4
Contract liabilities - noncurrent 57.9 $ 49.2
Revenue recognized that was previously included in current contract liabilities $ 145.0