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Stockholders' equity - ATM common stock offering program and Forward Equity Sales Agreements (Details) - ATM Common Stock Offering Program, Established December 2021 shares in Thousands, $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($) shares
Class of Stock
Common stock available for future issuance (in shares) | shares	699
Expected net proceeds from issuance of common stock	$ 103.1
Common stock available for future issuance (in dollars)	$ 141.9

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