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Employee plans - Schedule of Accumulated and Projected Benefit Obligation in Excess of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Retirement Benefits [Abstract]
Accumulated benefit obligation	$ 3,621.6	$ 4,498.8
Fair value of plan assets	2,960.6	3,587.7
Projected benefit obligation	3,623.2	4,500.5
Fair value of plan assets	$ 2,960.6	$ 3,587.7

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Amount of plan asset for defined benefit pension plan with projected benefit obligation in excess of plan assets.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of projected benefit obligation for defined benefit pension plan with projected benefit obligation in excess of plan assets.

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