Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions		3 Months Ended
		Jun. 30, 2023	Jun. 30, 2022
Changes in Accumulated Other Comprehensive Loss [Abstract]
Beginning balance		$ 592.8
Other comprehensive income (loss) before reclassifications		(1.0)	$ (24.7)
Income taxes		0.0	0.0
Total other comprehensive income (loss)		(0.5)	(23.8)
Ending balance		637.9
Accumulated Other Comprehensive Loss [Member]
Changes in Accumulated Other Comprehensive Loss [Abstract]
Beginning balance		(161.1)	(149.5)
Ending balance		(161.6)	(173.3)
Foreign Currency Translation [Member]
Changes in Accumulated Other Comprehensive Loss [Abstract]
Beginning balance		(57.5)	(39.1)
Other comprehensive income (loss) before reclassifications		(0.6)	(23.5)
Income taxes		0.0	0.0
Total other comprehensive income (loss)		(0.6)	(23.5)
Ending balance		(58.1)	(62.6)
Defined Benefit Plans [Member]
Changes in Accumulated Other Comprehensive Loss [Abstract]
Beginning balance		(104.4)	(111.1)
Other comprehensive income (loss) before reclassifications		0.0	0.0
Reclassification from accumulated other comprehensive income (loss)	[1]	1.0	1.3
Income taxes		(0.2)	0.0
Total other comprehensive income (loss)		0.8	1.3
Ending balance		(103.6)	(109.8)
Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Loss [Abstract]
Beginning balance		0.8	0.7
Other comprehensive income (loss) before reclassifications		(0.4)	(1.2)
Reclassification from accumulated other comprehensive income (loss)	[2]	(0.5)	(0.4)
Income taxes		0.2	0.0
Total other comprehensive income (loss)		(0.7)	(1.6)
Ending balance		$ 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 4 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.