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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Other comprehensive income (loss), net of tax        
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest $ 85.9 $ 100.2 $ (405.9) $ 147.3
Pension Plan and Restoration of Retirement Income Plan:        
Amortization of deferred net loss, net of tax of $0.3, $0.3, $0.6 and $0.5, respectively 1.2 1.0 2.0 1.7
Settlement cost, net of tax of $0.1, $0.1, $0.1 and $2.3, respectively 0.2 0.5 0.2 7.1
Postretirement Benefit Plans:        
Amortization of prior service credit, net of tax of ($0.1), ($0.1), ($0.3) and ($0.2), respectively (0.4) (0.4) (0.8) (0.9)
Amortization of deferred net gain, net of tax of $0.0, $0.0, $0.0 and $0.0, respectively 0.1 0.1 0.1 0.1
Other comprehensive loss from unconsolidated affiliates, net of tax of $0.0, $0.0, ($0.4) and $0.0, respectively 0.0 0.0 1.3 0.0
Other comprehensive income (loss), net of tax 0.9 1.0 0.0 7.8
Comprehensive income (loss) $ 86.8 $ 101.2 $ (405.9) $ 155.1