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Fair value measurements Insurance contracts (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Fair Value Disclosures [Abstract]      
Investments used to satisfy nonqualified benefit plans obligations $ 101,600,000 $ 83,300,000 $ 100,100,000
Net unrealized gain (loss) on investments used to satisfy obligations under nonqualified benefit plans $ 127,000 $ (3,700,000)