Earnings or loss per share - reconciliation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings (numerator)
Earnings, basic	$ 662.3	$ 508.0	$ 52.0
Dilutive impact of MCPS	24.2
Earnings, diluted	$ 686.5	$ 508.0	$ 52.0
Weighted average shares outstanding (denominator)
Weighted average shares outstanding, basic (in shares)	650.9	590.5	576.3
Dilutive effect of stock-based awards (in shares)	5.6	9.1	7.1
Dilutive impact of MCPS (in shares)	22.9
Weighted average shares outstanding, diluted (in shares)	679.4	599.6	583.4
Earnings per share:
Basic (in dollars per share)	$ 1.02	$ 0.86	$ 0.09
Diluted (in dollars per share)	$ 1.01	$ 0.85	$ 0.09