Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Changes in Accumulated Other Comprehensive Loss [Abstract]
Beginning balance				$ 592.8
Other comprehensive income (loss) before reclassifications		$ (12.7)	$ (23.4)	(13.7)	$ (48.1)
Income taxes		(0.2)	0.0	(0.2)	0.0
Total other comprehensive income (loss)		(12.1)	(22.0)	(12.6)	(45.8)
Ending balance		667.0		667.0
Accumulated Other Comprehensive Loss [Member]
Changes in Accumulated Other Comprehensive Loss [Abstract]
Beginning balance		(161.6)	(173.3)	(161.1)	(149.5)
Ending balance		(173.7)	(195.3)	(173.7)	(195.3)
Foreign Currency Translation [Member]
Changes in Accumulated Other Comprehensive Loss [Abstract]
Beginning balance		(58.1)	(62.6)	(57.5)	(39.1)
Other comprehensive income (loss) before reclassifications		(12.7)	(23.4)	(13.3)	(46.9)
Income taxes		0.0	0.0	0.0	0.0
Total other comprehensive income (loss)		(12.7)	(23.4)	(13.3)	(46.9)
Ending balance		(70.8)	(86.0)	(70.8)	(86.0)
Defined Benefit Plans [Member]
Changes in Accumulated Other Comprehensive Loss [Abstract]
Beginning balance		(103.6)	(109.8)	(104.4)	(111.1)
Other comprehensive income (loss) before reclassifications		0.0	0.0	0.0	0.0
Reclassification from accumulated other comprehensive income (loss)	[1]	1.1	1.4	2.1	2.7
Income taxes		(0.3)	0.0	(0.5)	0.0
Total other comprehensive income (loss)		0.8	1.4	1.6	2.7
Ending balance		(102.8)	(108.4)	(102.8)	(108.4)
Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Loss [Abstract]
Beginning balance		0.1	(0.9)	0.8	0.7
Other comprehensive income (loss) before reclassifications		0.0	0.0	(0.4)	(1.2)
Reclassification from accumulated other comprehensive income (loss)	[2]	(0.3)	0.0	(0.8)	(0.4)
Income taxes		0.1	0.0	0.3	0.0
Total other comprehensive income (loss)		(0.2)	0.0	(0.9)	(1.6)
Ending balance		$ (0.1)	$ (0.9)	$ (0.1)	$ (0.9)

[1] Amounts are included in the calculation of net periodic benefit cost for the Company’s defined benefit plans, which include pension and other postretirement plans. See Note 5 for additional information about the Company’s pension plans.

[2] Amounts represent net gains and losses associated with cash flow hedges that were reclassified to net earnings.