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Discontinued Operations - Reserves for Discontinued Operations (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Workers' compensation, product liability, and indemnification reserves $ 6.1 $ 1.9
Reserve for discontinued operations 108.3 76.6
Discontinued Operations    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Workers' compensation, product liability, and indemnification reserves 10.2 12.9
Postretirement medical and life insurance benefits reserve, net 4.7 5.5
Reserves for legal proceedings 93.4 58.2
Reserve for discontinued operations $ 108.3 $ 76.6