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Stock-Based Compensation (Allocation of Stock-Based Compensation Costs by Plan) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 27.3	$ 18.4	$ 38.1	$ 27.5
Income Statement Location [Axis]: morn:CostOfSalesExpensesMember
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	8.6	8.2	12.9	11.7
Income Statement Location [Axis]: morn:GeneralAndAdministrativeExpensesMember
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	15.8	7.1	21.0	10.8
Income Statement Location [Axis]: morn:SellingAndMarketingExpensesMember
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 2.9	$ 3.1	$ 4.2	$ 5.0

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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