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Fair value measurements Insurance contracts (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Fair Value Disclosures [Abstract]      
Investments used to satisfy nonqualified benefit plans obligations $ 105.9 $ 105.4 $ 98.0
Net unrealized gain (loss) on investments used to satisfy obligations under nonqualified benefit plans $ 3.8 $ 5.8