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Members' Equity, Valuation Assumptions (FY) (Details) - Class A-3 Units/ Class B Units - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair Value Assumptions [Abstract]
Volatility		70.00%	70.00%
Volatility, Minimum	50.00%
Volatility, Maximum	70.00%
Risk - free interest rate, Minimum	0.21%	1.68%	2.65%
Risk - free interest rate, Maximum	0.29%	2.49%	2.90%
Dividend yield	0.00%	0.00%	0.00%
Expected life of option (in years)	4 years	4 years	4 years
Weighted - average fair value of common stock (in dollars per share)	$ 724.28	$ 531.80	$ 305.35
Cumulative amount of compensation cost	$ 12.0

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- Definition

The fair value per share of common stock used in the weighted average fair value assumptions for stock option grants.

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- Definition

The amount of plan compensation cost recognized during the period.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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