Pension Benefit Obligations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
United States
Components of net periodic benefit cost:
Service costs		$ 1.3		$ 3.7
Interest cost on projected benefit obligation	$ 5.9	5.1	$ 17.8	15.5
Expected return on plan assets	(6.9)	(7.9)	(20.6)	(23.6)
Amortization of prior service cost	0.1		0.1
Amortization of net loss	0.9	1.0	2.7	3.0
Settlement loss recognized			0.1
Net periodic benefit cost		(0.5)	0.1	(1.4)
Change in benefit obligation:
Employer contributions			9.2
Expected remaining scheduled annual employer contributions for the current fiscal year	5.3		5.3
Foreign Pension Plan, Defined Benefit
Components of net periodic benefit cost:
Service costs	0.2	0.2	0.4	0.8
Interest cost on projected benefit obligation	7.4	8.1	22.5	24.3
Expected return on plan assets	(9.6)	(10.8)	(28.9)	(32.6)
Amortization of prior service cost			(0.1)	(0.1)
Amortization of net loss	1.0	2.0	3.1	6.2
Settlement loss recognized			0.1	0.2
Net periodic benefit cost	(1.0)	$ (0.5)	(2.9)	$ (1.2)
Change in benefit obligation:
Employer contributions			21.7
Expected remaining scheduled annual employer contributions for the current fiscal year	$ 5.7		$ 5.7