Pension Benefit Obligations (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2022
United States
Percentage of Plan Assets:
Interest cost on projected benefit obligation	$ 1.2	$ 1.0
Expected return on plan assets	(1.4)	(1.6)
Amortization of net loss	1.4	1.5
Net periodic benefit cost	1.2	0.9
Change in benefit obligation:
Employer contributions to Multiemployer Pension Plans	2.4
Expected remaining scheduled annual employer contributions for the current fiscal year			$ 9.0
International.
Percentage of Plan Assets:
Service costs	0.1	0.1
Interest cost on projected benefit obligation	6.4	5.3
Expected return on plan assets	(11.0)	(10.5)
Amortization of net loss	1.9	2.2
Net periodic benefit cost	(2.6)	$ (2.9)
Change in benefit obligation:
Employer contributions to Multiemployer Pension Plans	$ 5.4
Expected remaining scheduled annual employer contributions for the current fiscal year			$ 19.4