Retirement and Other Benefit Plans (Schedule Of Components Of Net Periodic Benefit Cost For Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Service cost	$ 0.0	$ 0.0	$ 0.0
Interest cost	3.2	3.9	3.8
Expected return on plan assets	(3.9)	(4.4)	(4.5)
Net actuarial loss	2.6	2.0	1.8
Net periodic benefit cost	1.9	1.5	1.1
Defined contribution plans	6.3	5.2	5.0
Total	$ 8.2	$ 6.7	$ 6.1