Revenue Recognition (Contract Assets and Liabilities) (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2019	Oct. 01, 2018
Contract Assets and Liabilities
Contract assets - current	$ 43.0	$ 53.0
Contract fulfillment costs - current	66.4	50.7
Contract liabilities - current	181.1	174.5
Contract liabilities - noncurrent	52.8	$ 53.5
Revenue recognized that was previously included in current contract liabilities	$ 100.0