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Accumulated Other Comprehensive (Loss) Income
 9 Months Ended
Sep. 30, 2021
Equity [Abstract]  
Accumulated Other Comprehensive (Loss) Income Accumulated Other Comprehensive (Loss) Income
The components of and changes in accumulated other comprehensive loss for the three and nine months ended September 30, 2021 and 2020 were as follows:

 Cumulative Translation AdjustmentPension and Postretirement BenefitsTotalCumulative Translation AdjustmentPension and Postretirement BenefitsTotal
(In millions)
 Three Months Ended September 30, 2021Three Months Ended September 30, 2020
Beginning balance$(11.0)$(9.4)$(20.4)$(36.1)$(13.7)$(49.8)
Currency translation (a)
(5.5)— (5.5)12.6 — 12.6 
Pension and OPEB activity, net of tax— 0.2 0.2 — 0.3 0.3 
Ending balance$(16.5)$(9.2)$(25.7)$(23.5)$(13.4)$(36.9)
Nine Months Ended September 30, 2021Nine Months Ended September 30, 2020
Beginning balance$(8.3)$(9.8)$(18.1)$(22.4)$(14.6)$(37.0)
Currency translation (a)
(8.2)— (8.2)(1.1)— (1.1)
Pension and OPEB activity, net of tax— 0.6 0.6 — 1.2 1.2 
Ending balance$(16.5)$(9.2)$(25.7)$(23.5)$(13.4)$(36.9)

(a)No income taxes were provided on currency translation as foreign earnings are considered permanently reinvested.