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CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($)
shares in Millions, $ in Millions
Sep. 30, 2022
Dec. 31, 2021
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Common stock issued (in shares) 73.3 72.5
Treasury stock, at cost (in shares) 5.5 5.3
Prepaid postretirement assets $ 170.7 [1] $ 159.7
Assets 2,058.1 [1] 2,419.5
Long-term postretirement liabilities 851.0 [1] 976.2
Liabilities and Equity 2,058.1 [1] $ 2,419.5
Change reflected    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Prepaid postretirement assets 15.2  
Assets 15.2  
Long-term postretirement liabilities 15.2  
Liabilities and Equity $ 15.2  
[1] These consolidated financial statements reflect a change of $15.2 million to increase both assets and liabilities, as compared to the previously filed consolidated financial statements on November 7, 2022.