Fair Value Measurements (Details) - Fair Value, Recurring - USD ($) $ in Millions	Sep. 30, 2025	Mar. 31, 2025
Liabilities:
Interest exchange swaps	$ 0.8	$ 0.0
Forward exchange contracts	0.2	0.0
Fair Value, Inputs, Level 2
Liabilities:
Interest exchange swaps	0.8	0.0
Forward exchange contracts	0.2	0.0
Term Loan A
Liabilities:
Debt instrument, fair value disclosure	293.4	0.0
Term Loan A \| Fair Value, Inputs, Level 2
Liabilities:
Debt instrument, fair value disclosure	300.0	0.0
5.5% Senior Notes \| Senior Notes
Liabilities:
5.5% Senior Notes	319.1	699.9
5.5% Senior Notes \| Senior Notes \| Fair Value, Inputs, Level 2
Liabilities:
5.5% Senior Notes	259.3	623.7
Programming Notes
Liabilities:
Debt instrument, fair value disclosure	88.2	90.7
Programming Notes \| Fair Value, Inputs, Level 2
Liabilities:
Debt instrument, fair value disclosure	88.2	90.7
Production Loan
Liabilities:
Debt instrument, fair value disclosure		0.0
Production Loan \| Fair Value, Inputs, Level 2
Liabilities:
Debt instrument, fair value disclosure	$ 16.2	$ 0.0

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Name:	us-gaap_DebtInstrumentFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant