Statements of Consolidated Shareholders' Deficit (Unaudited) - USD ($) $ in Millions | Total | Common Stock | Capital Surplus | Accumulated Deficit | Accumulated Other Comprehensive Loss | Treasury Stock, At Cost |
Beginning balance at Dec. 31, 2020 | $ (223.3) | $ 0.5 | $ 2,383.6 | $ (2,365.9) | $ (148.8) | $ (92.7) |
Equity-based compensation | 1.8 | | 1.8 | | | |
Net income (loss) | (63.3) | | | (63.3) | | |
Amortization of prior net losses | 3 | | | | 3 | |
Amortization of prior service credit | (0.1) | | | | (0.1) | |
Foreign currency translation | 0.7 | | | | 0.7 | |
Ending balance at Mar. 31, 2021 | (281.2) | 0.5 | 2,385.4 | (2,429.2) | (145.2) | (92.7) |
Beginning balance at Dec. 31, 2020 | (223.3) | 0.5 | 2,383.6 | (2,365.9) | (148.8) | (92.7) |
Net income (loss) | (64.4) | | | | | |
Ending balance at Sep. 30, 2021 | (306.2) | 0.5 | 2,387 | (2,430.3) | (170.7) | (92.7) |
Beginning balance at Mar. 31, 2021 | (281.2) | 0.5 | 2,385.4 | (2,429.2) | (145.2) | (92.7) |
Equity-based compensation | 0.9 | | 0.9 | | | |
Net income (loss) | (9.4) | | | (9.4) | | |
Amortization of prior net losses | 3 | | | | 3 | |
Amortization of prior service credit | (0.1) | | | | (0.1) | |
Settlement adjustment | 0.3 | | | | 0.3 | |
Foreign currency translation | 0.1 | | | | 0.1 | |
Ending balance at Jun. 30, 2021 | (286.4) | 0.5 | 2,386.3 | (2,438.6) | (141.9) | (92.7) |
Equity-based compensation | 0.7 | | 0.7 | | | |
Net income (loss) | 8.3 | | | 8.3 | | |
Amortization of prior net losses | 3.1 | | | | 3.1 | |
Amortization of prior service credit | (0.1) | | | | (0.1) | |
Settlement adjustment | 3.1 | | | | 3.1 | |
Net actuarial gain (loss) | (34.5) | | | | (34.5) | |
Foreign currency translation | (0.4) | | | | (0.4) | |
Ending balance at Sep. 30, 2021 | (306.2) | 0.5 | 2,387 | (2,430.3) | (170.7) | (92.7) |
Beginning balance at Dec. 31, 2021 | (363.5) | 0.5 | 2,388.3 | (2,475) | (184.6) | (92.7) |
Equity-based compensation | 1.8 | | 1.8 | | | |
Net income (loss) | (27.5) | | | (27.5) | | |
Amortization of prior net losses | 2.2 | | | | 2.2 | |
Amortization of prior service credit | (0.1) | | | | (0.1) | |
Foreign currency translation | 0.2 | | | | 0.2 | |
Ending balance at Mar. 31, 2022 | (386.9) | 0.5 | 2,390.1 | (2,502.5) | (182.3) | (92.7) |
Beginning balance at Dec. 31, 2021 | (363.5) | 0.5 | 2,388.3 | (2,475) | (184.6) | (92.7) |
Net income (loss) | 37.3 | | | | | |
Ending balance at Sep. 30, 2022 | (335.9) | 0.5 | 2,392.2 | (2,437.7) | (198.2) | (92.7) |
Beginning balance at Mar. 31, 2022 | (386.9) | 0.5 | 2,390.1 | (2,502.5) | (182.3) | (92.7) |
Equity-based compensation | 1.3 | | 1.3 | | | |
Net income (loss) | 60 | | | 60 | | |
Amortization of prior net losses | 2.2 | | | | 2.2 | |
Amortization of prior service credit | (0.1) | | | | (0.1) | |
Foreign currency translation | (0.6) | | | | (0.6) | |
Ending balance at Jun. 30, 2022 | (324.1) | 0.5 | 2,391.4 | (2,442.5) | (180.8) | (92.7) |
Equity-based compensation | 0.8 | | 0.8 | | | |
Net income (loss) | 4.8 | | | 4.8 | | |
Amortization of prior net losses | 2.2 | | | | 2.2 | |
Amortization of prior service credit | (0.1) | | | | (0.1) | |
Settlement adjustment | 4 | | | | 4 | |
Net actuarial gain (loss) | (22.1) | | | | (22.1) | |
Foreign currency translation | (1.4) | | | | (1.4) | |
Ending balance at Sep. 30, 2022 | $ (335.9) | $ 0.5 | $ 2,392.2 | $ (2,437.7) | $ (198.2) | $ (92.7) |