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Shareholders Equity Shareholders' Equity (Details) - USD ($) shares in Millions, $ in Millions |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2021 | Apr. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Apr. 30, 2021 | Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Beginning balance |  |  | $ 1,094.8 | $ 4,370.3 |  |  | $ 4,370.3 |
Net loss |  | $ (3,556.2) | (4.1) |  | $ (1,108.8) |  | (4,463.8) | $ (4,116.5)
Net other comprehensive income (loss) |  | (0.2) | (0.2) |  | $ (6.1) |  | (5.5) | $ (19.5)
Shares issued upon emergence (in shares) | 75.0 |  |  |  |  |  |  |
Ending balance | $ 1,094.8 | $ 1,094.8 | $ 1,090.5 |  |  |  | $ 1,094.8 |
Common Stock [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  | 206.1 | 75.0 | 206.1 | 205.9 | 205.9 | 206.1 | 205.9
Beginning balance |  | $ 82.6 | $ 0.8 | $ 82.6 | $ 82.5 | $ 82.5 | $ 82.6 | $ 82.5
Shares issued under share-based compensation plans, net |  | 0.0 |  |  | $ 0.1 |  |  |
Cancellation of Predecessor equity |  | (82.6) |  |  |  |  |  |
Cancellation of predecessor equity (in shares) |  | $ (206.1) |  |  |  |  |  |
Shares issued upon emergence (in shares) |  | 75.0 |  |  |  |  |  |
Issuance of Successor Common Shares and Warrants |  | $ 0.8 |  |  |  |  |  |
Shares issued under share-based compensation plans, net |  | 0.0 |  |  | 0.2 |  |  |
Ending balance (in shares) | 75.0 | 75.0 | 75.0 | 206.1 | 206.1 | 205.9 | 75.0 | 206.1
Ending balance | $ 0.8 | $ 0.8 | $ 0.8 | $ 82.6 | $ 82.6 | $ 82.5 | $ 0.8 | $ 82.6
Additional Paid-in Capital [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Beginning balance |  | 8,643.5 | 1,078.7 | 8,639.9 | 8,634.9 | 8,627.8 | 8,639.9 | 8,627.8
Shares issued under share-based compensation plans, net |  | (0.5) |  | (0.2) | (0.7) | (0.7) |  |
Share-based compensation cost |  | 1.0 |  | 3.8 | 5.7 | 7.8 |  |
Cancellation of Predecessor equity |  | (8,644.0) |  |  |  |  |  |
Issuance of Successor Common Shares and Warrants |  | 1,078.7 |  |  |  |  |  |
Ending balance | 1,078.7 | 1,078.7 | 1,078.7 | 8,643.5 | 8,639.9 | 8,634.9 | 1,078.7 | 8,639.9
Retained Earnings [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Beginning balance |  | (5,093.8) | 0.0 | (4,183.8) | (2,334.6) | 671.7 | (4,183.8) | 671.7
Net loss |  | (3,557.0) | (6.2) | (910.0) | (1,107.4) | (3,006.3) |  |
Cancellation of Predecessor equity |  | 8,650.8 |  |  |  |  |  |
Ending balance | 0.0 | 0.0 | (6.2) | (5,093.8) | (3,442.0) | (2,334.6) | 0.0 | (3,442.0)
AOCI Attributable to Parent [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Beginning balance |  | (93.2) | 0.0 | (87.9) | (7.2) | 6.2 | (87.9) | 6.2
Net changes in pension and other postretirement benefits |  |  |  | 0.1 |  |  |  |
Net other comprehensive income (loss) |  | (0.2) | (0.2) | (5.4) | (6.1) | (13.4) |  |
Cancellation of Predecessor equity |  | 93.4 |  |  |  |  |  |
Ending balance | 0.0 | 0.0 | (0.2) | (93.2) | (13.3) | (7.2) | 0.0 | (13.3)
Treasury Stock [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Beginning balance |  | (76.0) | 0.0 | (76.2) | (77.3) | (77.3) | (76.2) | (77.3)
Shares issued under share-based compensation plans, net |  | 0.5 |  | 0.2 | 0.6 | 0.9 |  |
Repurchase of shares |  |  |  |  | (0.1) | (0.9) |  |
Cancellation of Predecessor equity |  | 75.5 |  |  |  |  |  |
Ending balance | 0.0 | 0.0 | 0.0 | (76.0) | (76.8) | (77.3) | 0.0 | (76.8)
Noncontrolling Interest [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Beginning balance |  | (1.9) | (1.1) | (4.3) | (2.7) | (1.3) | (4.3) | (1.3)
Net loss |  | 0.8 | 2.1 | 2.4 | (1.4) | (1.4) |  |
Distributions to noncontrolling interests |  |  |  |  | (0.9) |  |  |
Ending balance | (1.1) | (1.1) | 1.0 | (1.9) | $ (5.0) | $ (2.7) | (1.1) | $ (5.0)
Warrant |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Beginning balance |  | 0.0 | 16.4 | 0.0 |  |  | 0.0 |
Issuance of Successor Common Shares and Warrants |  | 16.4 |  |  |  |  |  |
Ending balance | $ 16.4 | $ 16.4 | $ 16.4 | $ 0.0 |  |  | $ 16.4 |

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