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Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement Of Stockholders Equity [Abstract]    
Change in unrealized loss, tax $ (2.7) $ (0.8)
Change in minimum pension & postretirement liability, tax $ 0.0 $ 0.0