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Earnings per share - reconciliation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Earnings (numerator)
Basic	$ 121.5	$ 174.3
Dilutive effect of stock-based awards	0.0	0.0
Dilutive effect of warrants	$ 16.1
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock	62.9
Diluted	$ 121.5	$ 190.4
Weighted average shares outstanding (denominator)
Basic	674.7	610.1
Dilutive effect of stock-based awards	3.4	8.3
Diluted	678.1	681.3
Earnings per share:
Basic	$ 0.18	$ 0.29
Diluted	$ 0.18	$ 0.28

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