Debt - Indebtedness (Details) - USD ($) $ in Millions	Jun. 30, 2026	Mar. 31, 2026
Debt Instrument [Line Items]
Short-term Debt	$ 243.4	$ 118.9
Credit Agreement	0.0	37.8
Deferred financing costs	13.5	13.8
Long-term Debt	1,650.2	1,812.8
Debt, Long-term and Short-term, Combined Amount	1,893.7	1,931.7
Private Placement
Debt Instrument [Line Items]
Senior Notes, Noncurrent	313.7	438.9
Senior Notes
Debt Instrument [Line Items]
Senior Notes, Noncurrent	1,350.0	1,350.0
Private Placement
Debt Instrument [Line Items]
Senior Notes, Current	$ 243.4	$ 118.9