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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement of Comprehensive Income [Abstract]    
Defined benefit pension and other postretirement plan adjustments, tax $ 0.0 $ (0.3)
Net loss on investment securities, tax 0.0 0.0
Net gain (loss) on derivatives, tax $ 1.6 $ 0.8