Indebtedness (Details) $ in Millions		3 Months Ended							6 Months Ended
		Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)
Indebtedness [Abstract]
Total debt								$ 392.1	$ 392.1	$ 472.6
Less: current portion								(13.5)	(13.5)	(15.6)
Less: unamortized debt issuance costs								(4.8)	(4.8)	(5.0)
Total long-term debt								373.8	373.8	452.0
Maturities of long term debt and capital lease obligations [Abstract]
Remainder of 2021								6.8	6.8
2022								21.9	21.9
2023								21.9	21.9
2024								21.9	21.9
2025								201.3	201.3
2026 & beyond								118.3	118.3
Total debt								392.1	392.1	472.6
Credit Facility [Abstract]
Short-term debt								$ 17.1	17.1	14.8
Leverage ratio covenant limit								4.75
Long-term debt, fair value								$ 136.6	136.6	131.3
Forecast [Member]
Credit Facility [Abstract]
Leverage ratio covenant limit		3.25	3.50	3.75	4.75	5.75	5.25
Term Loans [Member]
Indebtedness [Abstract]
Total debt								185.5	$ 185.5	189.4
Fiscal year of maturity									Mar. 31, 2025
Maturities of long term debt and capital lease obligations [Abstract]
Total debt								$ 185.5	$ 185.5	189.4
Term Loans [Member] | Weighted Average [Member]
Credit Facility [Abstract]
Weighted-average interest rate								2.80%	2.80%
Revolving Credit Facility [Member]
Indebtedness [Abstract]
Total debt								$ 52.9	$ 52.9	127.2
Fiscal year of maturity									Mar. 31, 2025
Maturities of long term debt and capital lease obligations [Abstract]
Total debt								$ 52.9	$ 52.9	127.2
Revolving Credit Facility [Member] | Weighted Average [Member]
Credit Facility [Abstract]
Weighted-average interest rate								2.80%	2.80%
Foreign Credit Agreements [Member]
Credit Facility [Abstract]
Short-term debt								$ 17.1	$ 17.1	14.8
Domestic Revolving Credit Facility [Member]
Credit Facility [Abstract]
Letters of credit outstanding								5.7	5.7
Available for future borrowings								191.4	191.4
5.8% Senior Notes [Member]
Indebtedness [Abstract]
Total debt								$ 50.0	$ 50.0	50.0
Interest rate percentage								5.80%	5.80%
Fiscal year of maturity									Mar. 31, 2027
Maturities of long term debt and capital lease obligations [Abstract]
Total debt								$ 50.0	$ 50.0	50.0
5.9% Senior Notes [Member]
Indebtedness [Abstract]
Total debt								$ 100.0	$ 100.0	100.0
Interest rate percentage								5.90%	5.90%
Fiscal year of maturity									Mar. 31, 2029
Maturities of long term debt and capital lease obligations [Abstract]
Total debt								$ 100.0	$ 100.0	100.0
Other [Member]
Indebtedness [Abstract]
Total debt	[1]							3.7	3.7	6.0
Maturities of long term debt and capital lease obligations [Abstract]
Total debt	[1]							$ 3.7	$ 3.7	$ 6.0

[1] Other long-term debt primarily includes finance lease obligations and borrowings by foreign subsidiaries.