Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024
Changes in Accumulated Other Comprehensive Loss [Abstract]
Beginning balance			$ 910.2
Ending balance	$ 1,121.8		1,121.8
Pension termination charge	116.1		116.1
Pension termination charge resulted in a net income tax benefit	13.1		13.1
Accumulated other comprehensive loss
Changes in Accumulated Other Comprehensive Loss [Abstract]
Beginning balance	(137.7)	$ (147.8)	(181.3)	$ (163.4)
Other comprehensive income (loss) before reclassifications	7.3	(48.3)	48.7	(34.1)
Income taxes	(14.1)	(0.2)	(14.9)	(0.8)
Total other comprehensive income (loss)	110.1	(47.5)	153.7	(31.9)
Ending balance	(27.6)	(195.3)	(27.6)	(195.3)
Foreign Currency Translation
Changes in Accumulated Other Comprehensive Loss [Abstract]
Beginning balance	(35.5)	(49.0)	(76.8)	(62.8)
Other comprehensive income (loss) before reclassifications	4.3	(48.2)	45.6	(34.4)
Income taxes	0.0	0.0	0.0	0.0
Total other comprehensive income (loss)	4.3	(48.2)	45.6	(34.4)
Ending balance	(31.2)	(97.2)	(31.2)	(97.2)
Cash Flow Hedges
Changes in Accumulated Other Comprehensive Loss [Abstract]
Beginning balance		0.3	(0.7)	0.1
Other comprehensive income (loss) before reclassifications	(0.1)	(0.1)	0.0	0.3
Reclassification from accumulated other comprehensive income (loss)	0.1	(0.1)	0.9	(0.2)
Income taxes	0.0	0.1	(0.2)	0.0
Total other comprehensive income (loss)	0.0	(0.1)	0.7	0.1
Ending balance		0.2		0.2
Defined Benefit Plans
Changes in Accumulated Other Comprehensive Loss [Abstract]
Beginning balance	(102.2)	(99.1)	(103.8)	(100.7)
Other comprehensive income (loss) before reclassifications	3.1	0.0	3.1	0.0
Income taxes	(14.1)	(0.3)	(14.7)	(0.8)
Total other comprehensive income (loss)	105.8	0.8	107.4	2.4
Ending balance	3.6	(98.3)	3.6	(98.3)
Accumulated Defined Benefit Plans Adjustment, Pension Termination Charges, Attributable to Parent [Member]
Changes in Accumulated Other Comprehensive Loss [Abstract]
Reclassification from accumulated other comprehensive income (loss)	116.1		116.1
Reclassification Defined Benefit Plans
Changes in Accumulated Other Comprehensive Loss [Abstract]
Reclassification from accumulated other comprehensive income (loss)	$ 0.7	$ 1.1	$ 2.9	$ 3.2