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v3.21.1

Shareholders Equity Shareholders' Equity (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total debtors' equity | $ 3,461.2 |  |  |  | $ 4,370.3 |
Net loss | (907.6) |  | $ (3,007.7) |  |  |
Other Comprehensive Income (Loss), Net of Tax | (5.3) |  | $ (13.4) |  |  |
Common Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares, Issued |  | 206.1 |  | 205.9 | 206.1 | 205.9
Total debtors' equity |  | $ 82.6 |  | $ 82.5 | $ 82.6 | $ 82.5
Additional Paid-in Capital [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total debtors' equity |  | 8,643.5 |  | 8,634.9 | 8,639.9 | 8,627.8
Shares Issued Under Share Based Compensation Plans, Amount |  | (0.2) |  | (0.7) |  |
APIC, Share-based Payment Arrangement, Increase for Cost Recognition |  | 3.8 |  | 7.8 |  |
Retained Earnings [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total debtors' equity |  | (5,093.8) |  | (2,334.6) | (4,183.8) | 671.7
Net loss |  | (910.0) |  | (3,006.3) |  |
AOCI Attributable to Parent [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total debtors' equity |  | (93.2) |  | (7.2) | (87.9) | 6.2
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax | $ 0.1 |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax |  | (5.4) |  | (13.4) |  |
Treasury Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total debtors' equity |  | (76.0) |  | (77.3) | (76.2) | (77.3)
Shares Issued Under Share Based Compensation Plans, Amount |  | 0.2 |  | 0.9 |  |
Stock Repurchased During Period, Value |  |  |  | (0.9) |  |
Noncontrolling Interest [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total debtors' equity |  | (1.9) |  | (2.7) | $ (4.3) | $ (1.3)
Net loss |  | $ 2.4 |  | $ (1.4) |  |

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