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Summary of Business and Significant Accounting Policies - Narrative (Details) $ in Millions	12 Months Ended
	Jun. 30, 2026 USD ($) revenue_stream performanceObligation	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)
Class of Stock [Line Items]
Number of revenue streams \| revenue_stream	2
Expected renewal period for LTV	10 years
Increase in product specific constraint	15.00%
Number of additional forms of revenue \| revenue_stream	2
Number of performance obligation \| performanceObligation	1
Allowance for credit loss	$ 7.1	$ 11.8
Allowance for credit loss, write-off	4.6	0.9	$ 1.4
Advertising expense	$ 258.3	$ 263.7	$ 294.7
Minimum
Class of Stock [Line Items]
Capitalized computer software, amortization period	3 years
Maximum
Class of Stock [Line Items]
Capitalized computer software, amortization period	5 years
UHC \| Accounts And Commission Receivable \| Customer Concentration Risk
Class of Stock [Line Items]
Concentration risk, percentage	34.00%	34.00%
UHC \| Revenue from Contract with Customer Benchmark \| Customer Concentration Risk
Class of Stock [Line Items]
Concentration risk, percentage	39.00%	37.00%	30.00%
Humana \| Accounts And Commission Receivable \| Customer Concentration Risk
Class of Stock [Line Items]
Concentration risk, percentage	21.00%	21.00%
Humana \| Revenue from Contract with Customer Benchmark \| Customer Concentration Risk
Class of Stock [Line Items]
Concentration risk, percentage	13.00%	15.00%	17.00%
Wellcare \| Revenue from Contract with Customer Benchmark \| Customer Concentration Risk
Class of Stock [Line Items]
Concentration risk, percentage	12.00%	11.00%	16.00%