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Earnings per share - reconciliation (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Earnings (numerator)        
Basic $ 108.4 $ 167.0 $ 222.6 $ 520.6
Dilutive effect of stock-based awards 0.0 0.0 0.0 0.0
Dilutive effect of warrants   $ 0.0   $ 24.2
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock   0.0   30.6
Diluted $ 108.4 $ 167.0 $ 222.6 $ 544.8
Weighted average shares outstanding (denominator)        
Basic 676.0 674.1 675.4 643.0
Dilutive effect of stock-based awards 2.5 5.2 2.7 6.8
Diluted 678.5 679.3 678.1 680.4
Earnings per share:        
Basic $ 0.16 $ 0.25 $ 0.33 $ 0.81
Diluted $ 0.16 $ 0.25 $ 0.33 $ 0.80