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Summary of Significant Accounting policies - Share Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Summary of Significant Accounting Policies
Amount the company can repurchase		$ 50.0
Treasury Stock, Value, Acquired, Cost Method	$ 7.5
Treasury Stock, Shares, Acquired	0.3
Treasury Stock Acquired, Average Cost Per Share	$ 21.82

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Amount of stock repurchase plan authorized.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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