Indebtedness (Details) - USD ($) $ in Millions		6 Months Ended
		Sep. 30, 2018	Mar. 31, 2018
Long-term Debt and Capital Lease Obligations [Abstract]
Total debt		$ 411.8	$ 431.6
Less: current portion		(43.1)	(39.9)
Less: unamortized debt issuance costs		(4.7)	(5.4)
Total long-term debt		364.0	386.3
Credit Facility [Abstract]
Short-term debt		72.8	53.2
Available for future borrowings		127.1
Long-term debt, fair value		145.0	153.1
Domestic Revolving Credit Facility [Member]
Credit Facility [Abstract]
Letters of credit outstanding		4.3
Available for future borrowings		125.9
Foreign Credit Agreements [Member]
Credit Facility [Abstract]
Short-term debt		28.0	31.9
Available for future borrowings		1.2
Term Loans [Member]
Long-term Debt and Capital Lease Obligations [Abstract]
Total debt		$ 251.1	267.8
Fiscal year of maturity		Mar. 31, 2022
Multi Currency Revolving Credit Facility [Member]
Credit Facility [Abstract]
Short-term debt		$ 44.8	21.3
Maximum borrowing capacity		$ 175.0
Expiration date		Nov. 30, 2021
6.8% Senior Notes [Member]
Long-term Debt and Capital Lease Obligations [Abstract]
Total debt		$ 93.0	101.0
Interest rate percentage		6.80%
Fiscal year of maturity		Mar. 31, 2021
5.8% Senior Notes [Member]
Long-term Debt and Capital Lease Obligations [Abstract]
Total debt		$ 50.0	50.0
Interest rate percentage		5.80%
Fiscal year of maturity		Mar. 31, 2027
Other [Member]
Long-term Debt and Capital Lease Obligations [Abstract]
Total debt	[1]	$ 17.7	$ 12.8
Fiscal year of maturity	[1]	Mar. 31, 2034

[1] Other long-term debt includes borrowings by foreign subsidiaries, capital lease obligations and other financing-type obligations.