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Discontinued Operations Reserves for Discontinued Operations (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Workers' compensation, product liability, and indemnification reserves $ 2.2 $ 6.1
Reserve for discontinued operations 72.2 63.2
Workers’ compensation, product liability, and indemnification reserves    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Workers' compensation, product liability, and indemnification reserves 23.6 22.6
Postretirement medical and life insurance benefits reserve, net    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Postretirement medical and life insurance benefits reserve, net 7.0 7.6
SEC Schedule, 12-09, Reserve, Legal    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Reserves for legal proceedings $ 41.6 $ 33.0