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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2019
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, 2019 was as follows (in millions):
| Shares |  | Par Value |  | Additional Paid-in Capital |  | Retained Earnings |  | AOCI |  | Treasury Shares |  | Non-controlling Interest
BALANCE, December 31, 2016 | 77.6 |  |  | $ | 31.1 |  |  | $ | 6,402.2 |  |  | $ | 1,864.1 |  |  | $ | 19.0 |  |  | $ | (65.8 | ) |  | $ | 4.4 |
Net loss | — |  |  | — |  |  | — |  |  | (303.7 | ) |  | — |  |  | — |  |  | (.5 | )
Dividends paid ($0.16 per share) | — |  |  | — |  |  | — |  |  | (13.6 | ) |  | — |  |  | — |  |  | — |
Cumulative-effect reduction from adoption of ASU 2016-16 |  |  |  |  |  |  | (14.1 | ) |  |  |  |  |  |
Distributions to noncontrolling interests | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (6.0 | )
Equity issuance in connection with Atwood Merger | 33.1 |  |  | 13.2 |  |  | 757.5 |  |  | — |  |  | — |  |  | — |  |  | — |
Shares issued under share-based compensation plans, net | 1.1 |  |  | .5 |  |  | (.4 | ) |  | — |  |  | — |  |  | (1.3 | ) |  | — |
Repurchase of shares | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (1.9 | ) |  | — |
Share-based compensation cost | — |  |  | — |  |  | 35.7 |  |  | — |  |  | — |  |  | — |  |  | — |
Net other comprehensive income | — |  |  | — |  |  | — |  |  | — |  |  | 9.6 |  |  | — |  |  | — |
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 |  |  | — |  |  | — |
Shares issued under share-based compensation plans, net | 3.4 |  |  | 1.4 |  |  | (.6 | ) |  | — |  |  | — |  |  | (1.3 | ) |  | — |
Distributions to noncontrolling interests | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (3.6 | )
Repurchase of shares | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (1.9 | ) |  | — |
Share-based compensation cost | — |  |  | — |  |  | 30.6 |  |  | — |  |  | — |  |  | — |  |  | — |
Net other comprehensive income | — |  |  | — |  |  | — |  |  | — |  |  | (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 | ) |  | — |
Repurchase of shares | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (4.5 | ) |  | — |
Share-based compensation cost | — |  |  | — |  |  | 37.2 |  |  | — |  |  | — |  |  | — |  |  | — |
Equity issuance cost | — |  |  | — |  |  | (.6 | ) |  | — |  |  | — |  |  | — |  |  | — |
Net changes in pension and other postretirement benefits | — |  |  | — |  |  | — |  |  | — |  |  | (21.7 | ) |  | — |  |  | — |
Distributions to noncontrolling interests | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (4.5 | )
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 | )

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