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Summary of Significant Accounting Policies, Intangible Assets (FY) (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Intangible Assets [Abstract]
Intangible assets amortization period	10 years 6 months	13 years 2 months 12 days
Minimum
Intangible Assets [Abstract]
Intangible assets amortization period		5 years
Maximum
Intangible Assets [Abstract]
Intangible assets amortization period		15 years

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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