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CONSOLIDATED CONDENSED STATEMENT OF COMPREHENSIVE INCOME (Parenthetical) (Parentheticals) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Net change in postretirement benefit plans, Tax Benefits $ 1.2 $ 2.1 $ 2.0 $ 3.0
Amortization of prior service costs, Tax (Expense) Benefit (0.3) (0.3) (0.8) (1.3)
Amortization of net actuarial loss, Tax Benefits 0.6 1.1 1.9 3.0
Loss from plan settlement or curtailment, Tax Benefit 0.3 1.3 0.3 1.3
Unrealized change in net actuarial gain, Tax Expense $ 0.6 $ 0.0 $ 0.6 $ 0.0