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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Prior service credit arising during period, tax $ 0.0 $ 0.0 $ 1.1
Net actuarial gain (loss) arising during period, tax (0.2) 1.3 (4.8)
Settlement effects arising during period, tax 0.0 0.0 1.1
Less: amortization of actuarial loss, tax 0.3 0.5 1.2
Less: amortization of prior service credit, tax (0.5) (0.5) (0.5)
Net gain (loss) on investment securities, tax (0.1) (2.5) (0.1)
Net gain (loss) on derivatives, tax $ 1.5 $ (0.1) $ 0.1