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Equity (Q3) (Details)	3 Months Ended
	Sep. 30, 2021 vote shares	Jun. 15, 2021 shares
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)	75,000,000	75,000,000
Preferred stock, shares issued (in shares)	0
Preferred stock, shares outstanding (in shares)	0
WMH Units
Noncontrolling Interest [Line Items]
Noncontrolling interests, percent of outstanding units held	56.60%
Class A Common Stock
Class of Stock [Line Items]
Votes per share | vote	1

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