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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2020
Stockholders' Equity Note [Abstract] |
Schedule Of Activity In Our Various Shareholders' Equity | Activity in our various shareholders' equity accounts for each of the years in the three-year period ended December 31, 2020 was as follows (in millions, except per share amounts):
| Shares |  | Par Value |  | Additional Paid-in Capital |  | Retained Earnings |  | AOCI |  | Treasury Shares |  | Non-controlling Interest
BALANCE, December 31, 2017 | 111.8 |  |  | $ | 44.8 |  |  | $ | 7,195.0 |  |  | $ | 1,532.7 |  |  | $ | 28.6 |  |  | $ | (69.0) |  |  | $ | (2.1) |
Net loss | — |  |  | — |  |  | — |  |  | (639.7) |  |  | — |  |  | — |  |  | 3.1 |
Dividends paid ($0.16 per share) | — |  |  | — |  |  | — |  |  | (18.0) |  |  | — |  |  | — |  |  | — |
Cumulative-effect reduction from adoption of ASU 2018-02 | — |  |  | — |  |  | — |  |  | (.8) |  |  | .8 |  |  | — |  |  | — |
Distributions to noncontrolling interests | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (3.6) |
Shares issued under share-based compensation plans, net | 3.4 |  |  | 1.4 |  |  | (.6) |  |  | — |  |  | — |  |  | (1.3) |  |  | — |
Repurchase of shares | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (1.9) |  |  | — |
Share-based compensation cost | — |  |  | — |  |  | 30.6 |  |  | — |  |  | — |  |  | — |  |  | — |
Net other comprehensive loss | — |  |  | — |  |  | — |  |  | — |  |  | (11.2) |  |  | — |  |  | — |
BALANCE, December 31, 2018 | 115.2 |  |  | 46.2 |  |  | 7,225.0 |  |  | 874.2 |  |  | 18.2 |  |  | (72.2) |  |  | (2.6) |
Net loss | — |  |  | — |  |  | — |  |  | (198.0) |  |  | — |  |  | — |  |  | 5.8 |
Dividends paid ($0.04 per share) | — |  |  | — |  |  | — |  |  | (4.5) |  |  | — |  |  | — |  |  | — |
Equity issuance in connection with the Rowan Transaction | 88.0 |  |  | 35.2 |  |  | 1,367.5 |  |  | — |  |  | — |  |  | .1 |  |  | — |
Shares issued under share-based compensation plans, net | 2.7 |  |  | 1.1 |  |  | (1.3) |  |  | — |  |  | — |  |  | (.7) |  |  | — |
Distributions to noncontrolling interests | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (4.5) |
Repurchase of shares | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (4.5) |  |  | — |
Equity issuance cost | — |  |  | — |  |  | (.6) |  |  | — |  |  | — |  |  | — |  |  | — |
Share-based compensation cost | — |  |  | — |  |  | 37.2 |  |  | — |  |  | — |  |  | — |  |  | — |
Net changes in pension and other postretirement benefits | — |  |  | — |  |  | — |  |  | — |  |  | (21.7) |  |  | — |  |  | — |
Net other comprehensive income | — |  |  | — |  |  | — |  |  | — |  |  | 9.7 |  |  | — |  |  | — |
BALANCE, December 31, 2019 | 205.9 |  |  | 82.5 |  |  | 8,627.8 |  |  | 671.7 |  |  | 6.2 |  |  | (77.3) |  |  | (1.3) |
Net loss | — |  |  | — |  |  | — |  |  | (4,855.5) |  |  | — |  |  | — |  |  | (2.1) |
Shares issued under share-based compensation plans, net | .2 |  |  | .1 |  |  | (1.9) |  |  | — |  |  | — |  |  | 2.0 |  |  | — |
Repurchase of shares | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (.9) |  |  | — |
Share-based compensation cost | — |  |  | — |  |  | 21.2 |  |  | — |  |  | — |  |  | — |  |  | — |
Net changes in pension and other postretirement benefits | — |  |  | — |  |  | — |  |  | — |  |  | (76.5) |  |  | — |  |  | — |
Purchase of noncontrolling interests | — |  |  | — |  |  | (7.2) |  |  | — |  |  | — |  |  | — |  |  | — |
Distributions to noncontrolling interests | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (.9) |
Net other comprehensive loss | — |  |  | — |  |  | — |  |  | — |  |  | (17.6) |  |  | — |  |  | — |
BALANCE, December 31, 2020 | 206.1 |  |  | $ | 82.6 |  |  | $ | 8,639.9 |  |  | $ | (4,183.8) |  |  | $ | (87.9) |  |  | $ | (76.2) |  |  | $ | (4.3) |

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