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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2020
Equity [Abstract]  
Schedule of Components of Accumulated Other Comprehensive Income (Loss), Net of Taxes The components of accumulated other comprehensive loss, net of taxes, were as follows for the years ended December 31, 2020 and 2019 (in millions):
20202019
Employee benefit plans:
Pension plans$(48.9)$(47.4)
Post-retirement plans(3.6)0.2 
Non-qualified benefit plans(0.8)(0.8)
Total employee benefit plans(53.3)(48.0)
Interest rate swap(6.7)(0.8)
Accumulated other comprehensive income (loss)$(60.0)$(48.8)
The changes in accumulated other comprehensive income (loss) by component for the years ended December 31, 2020, 2019 and 2018 were as follows (in millions, net of tax):
Employee Benefit PlansInterest Rate SwapTotal
Balance, January 1, 2018$(44.2)$1.9 $(42.3)
Other comprehensive income (loss) before reclassifications, net of taxes of $0
(4.9)1.0 (3.9)
Amounts reclassified from accumulated other comprehensive income (loss), net of taxes of $0
3.4 — 3.4 
Impact of adoption of ASU 2018-02(9.5)0.4 (9.1)
Balance, December 31, 2018$(55.2)$3.3 $(51.9)
Other comprehensive income (loss) before reclassifications, net of taxes of $0
5.3 (4.0)1.3 
Amounts reclassified from accumulated other comprehensive income (loss), net of taxes of $0
1.9 (0.1)1.8 
Balance, December 31, 2019$(48.0)$(0.8)$(48.8)
Other comprehensive income (loss) before reclassifications, net of taxes of $0
(7.7)(6.9)(14.6)
Amounts reclassified from accumulated other comprehensive income (loss), net of taxes of $0
2.4 1.0 3.4 
Balance, December 31, 2020$(53.3)$(6.7)$(60.0)
Schedule of Reclassification out of Accumulated Other Comprehensive Income (Loss)
The reclassifications of other comprehensive income (loss) components out of accumulated other comprehensive income (loss) for the years ended December 31, 2020, 2019 and 2018 were as follows (in millions):
202020192018
Unrealized interest rate hedging gain (loss)$(6.9)$(4.0)$1.0 
Actuarial loss(7.7)5.3 (4.9)
Impact of reclassification adjustment to interest expense included in Net Income (Loss)1.0 (0.1)— 
Amortization of defined benefit pension items reclassified to net periodic pension cost:
Net loss*2.5 4.0 4.6 
Prior service cost*(0.1)— — 
Prior service credit*— (0.7)(0.7)
Curtailment (gain)/loss*— (1.4)(0.6)
Settlement (gain)/loss*— — 0.1 
Total before income tax$(11.2)$3.1 $(0.5)
Income taxes— — — 
Other comprehensive income (loss), net of tax$(11.2)$3.1 $(0.5)
* This accumulated other comprehensive income (loss) component is included in the computation of net periodic pension cost (refer to Note 17).