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STOCKHOLDERS' EQUITY (Tables)
 9 Months Ended
Sep. 30, 2021
Stockholders' Equity Note [Abstract]  
Schedule of accumulated other comprehensive income (loss)
The table below presents changes in AOCI by component for the three and nine months ended September 30, 2021 and 2020. All amounts are net of tax (in millions).
Three Months Ended
September 30, 2021		Three Months Ended
September 30, 2020
CTADerivative Hedging Adj.Debt & Equity Securities Adj.Pension Liability Adj.TotalCTADerivative Hedging Adj.Debt & Equity Securities Adj.Pension Liability Adj.Total
Beginning balance$(156.6)$13.7 $0.6 $(57.7)$(200.0)$(243.5)$(7.1)$3.6 $(47.8)$(294.8)
Other comprehensive income (loss) before reclassifications
(27.1)1.1 (0.2)1.5 (24.7)45.0 (2.7)0.3 (2.0)40.6 
Amounts reclassified from AOCI
— (5.0)— 0.4 (4.6)— (0.1)— 0.4 0.3 
Net other comprehensive income (loss)
(27.1)(3.9)(0.2)1.9 (29.3)45.0 (2.8)0.3 (1.6)40.9 
Ending balance
$(183.7)$9.8 $0.4 $(55.8)$(229.3)$(198.5)$(9.9)$3.9 $(49.4)$(253.9)

Nine Months Ended
September 30, 2021		Nine Months Ended
September 30, 2020
CTADerivative Hedging Adj.Debt & Equity Securities Adj.Pension Liability Adj.TotalCTADerivative Hedging Adj.Debt & Equity Securities Adj.Pension Liability Adj.Total
Beginning balance$(145.2)$(6.0)$1.2 $(58.4)$(208.4)$(208.2)$(0.8)$2.6 $(51.1)$(257.5)
Other comprehensive income (loss) before reclassifications
(38.5)21.6 (0.8)1.1 (16.6)9.7 (12.5)1.3 0.5 (1.0)
Amounts reclassified from AOCI
— (5.8)— 1.5 (4.3)— 3.4 — 1.2 4.6 
Net other comprehensive income (loss)
(38.5)15.8 (0.8)2.6 (20.9)9.7 (9.1)1.3 1.7 3.6 
Ending balance $(183.7)$9.8 $0.4 $(55.8)$(229.3)$(198.5)$(9.9)$3.9 $(49.4)$(253.9)
Schedule of weighted-average assumptions used in the valuations
The following table presents the weighted-average assumptions used in the valuation:
Grant date
March 4, 2021
Dividend yields1.12 %
Expected volatility53.03 %
Risk free interest rate0.29 %
Expected life (in years)3