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Shareholders Equity (Tables) | 9 Months Ended
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Sep. 30, 2020
Shareholders' Equity [Abstract] |
Schedule Of Activity In Our Various Shareholders Equity [Table Text Block] | Activity in our various shareholders' equity accounts for the three and nine months ended September 30, 2020 and 2019 were as follows (in millions, except per share amounts):
| Shares |  | Par Value |  | Additional Paid-in Capital |  | Retained Earnings (Deficit) |  | AOCI |  | Treasury Shares |  | Non-controlling Interest
BALANCE, December 31, 2019 | 205.9 |  |  | $ | 82.5 |  |  | $ | 8,627.8 |  |  | $ | 671.7 |  |  | $ | 6.2 |  |  | $ | (77.3) |  |  | $ | (1.3) |
Net loss | — |  |  | — |  |  | — |  |  | (3,006.3) |  |  | — |  |  | — |  |  | (1.4) |
Shares issued under share-based compensation plans, net | — |  |  | — |  |  | (.7) |  |  | — |  |  | — |  |  | .9 |  |  | — |
Repurchase of shares | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (.9) |  |  | — |
Share-based compensation cost | — |  |  | — |  |  | 7.8 |  |  | — |  |  | — |  |  | — |  |  | — |
Net other comprehensive loss | — |  |  | — |  |  | — |  |  | — |  |  | (13.4) |  |  | — |  |  | — |
BALANCE, March 31, 2020 | 205.9 |  |  | $ | 82.5 |  |  | $ | 8,634.9 |  |  | $ | (2,334.6) |  |  | $ | (7.2) |  |  | $ | (77.3) |  |  | $ | (2.7) |
Net loss | — |  |  | — |  |  | — |  |  | (1,107.4) |  |  | — |  |  | — |  |  | (1.4) |
Shares issued under share-based compensation plans, net | .2 |  |  | .1 |  |  | (.7) |  |  | — |  |  | — |  |  | .6 |  |  | — |
Repurchase of shares | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (.1) |  |  | — |
Share-based compensation cost | — |  |  | — |  |  | 5.7 |  |  | — |  |  | — |  |  | — |  |  | — |
Net other comprehensive loss | — |  |  | — |  |  | — |  |  | — |  |  | (6.1) |  |  | — |  |  | — |
Distributions to noncontrolling interests | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (.9) |
BALANCE, June 30, 2020 | 206.1 |  |  | $ | 82.6 |  |  | $ | 8,639.9 |  |  | $ | (3,442.0) |  |  | $ | (13.3) |  |  | $ | (76.8) |  |  | $ | (5.0) |
Net loss | — |  |  | — |  |  | — |  |  | (670.9) |  |  | — |  |  | — |  |  | (1.1) |
Shares issued under share-based compensation plans, net | — |  |  | — |  |  | (.5) |  |  | — |  |  | — |  |  | .5 |  |  | — |
Purchase of noncontrolling interests | — |  |  | — |  |  | (7.2) |  |  | — |  |  | — |  |  | — |  |  | — |
Share-based compensation cost | — |  |  | — |  |  | 4.3 |  |  | — |  |  | — |  |  | — |  |  | — |
Net other comprehensive income | — |  |  | — |  |  | — |  |  | — |  |  | 2.1 |  |  | — |  |  | — |
BALANCE, September 30, 2020 | 206.1 |  |  | $ | 82.6 |  |  | $ | 8,636.5 |  |  | $ | (4,112.9) |  |  | $ | (11.2) |  |  | $ | (76.3) |  |  | $ | (6.1) |
| Shares |  | Par Value |  | Additional Paid-in Capital |  | Retained Earnings |  | AOCI |  | Treasury Shares |  | Non-controlling Interest
BALANCE, December 31, 2018 | 115.2 |  |  | $ | 46.2 |  |  | $ | 7,225.0 |  |  | $ | 874.2 |  |  | $ | 18.2 |  |  | $ | (72.2) |  |  | $ | (2.6) |
Net loss | — |  |  | — |  |  | — |  |  | (190.4) |  |  | — |  |  | — |  |  | 2.4 |
Dividends paid ($0.04 per share) | — |  |  | — |  |  | — |  |  | (4.5) |  |  | — |  |  | — |  |  | — |
Shares issued under share-based compensation plans, net | — |  |  | — |  |  | (.1) |  |  | — |  |  | — |  |  | .1 |  |  | — |
Repurchase of shares | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (2.8) |  |  | — |
Share-based compensation cost | — |  |  | — |  |  | 5.3 |  |  | — |  |  | — |  |  | — |  |  | — |
Net other comprehensive income | — |  |  | — |  |  | — |  |  | — |  |  | 1.5 |  |  | — |  |  | — |
BALANCE, March 31, 2019 | 115.2 |  |  | $ | 46.2 |  |  | $ | 7,230.2 |  |  | $ | 679.3 |  |  | $ | 19.7 |  |  | $ | (74.9) |  |  | $ | (0.2) |
Net income | — |  |  | — |  |  | — |  |  | 405.5 |  |  | — |  |  | — |  |  | 1.8 |
Equity issuance in connection with the Rowan Transaction | 88.0 |  |  | 35.2 |  |  | 1,367.5 |  |  | — |  |  | — |  |  | .1 |  |  | — |
Shares issued under share-based compensation plans, net | 2.6 |  |  | 1.1 |  |  | (1.1) |  |  | — |  |  | — |  |  | (.8) |  |  | — |
Repurchase of shares | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (1.4) |  |  | — |
Share-based compensation cost | — |  |  | — |  |  | 13.8 |  |  | — |  |  | — |  |  | — |  |  | — |
Net other comprehensive income | — |  |  | — |  |  | — |  |  | — |  |  | .2 |  |  | — |  |  | — |
BALANCE, June 30, 2019 | 205.8 |  |  | $ | 82.5 |  |  | $ | 8,610.4 |  |  | $ | 1,084.8 |  |  | $ | 19.9 |  |  | $ | (77.0) |  |  | $ | 1.6 |
Net loss | — |  |  | — |  |  | — |  |  | (197.1) |  |  | — |  |  | — |  |  | (.4) |
Equity issuance costs | — |  |  | — |  |  | (.6) |  |  | — |  |  | — |  |  | — |  |  | — |
Share-based compensation cost | — |  |  | — |  |  | 9.7 |  |  | — |  |  | — |  |  | — |  |  | — |
Distributions to noncontrolling interests | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (2.1) |
Repurchase of shares | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (.2) |  |  | — |
Net other comprehensive loss | — |  |  | — |  |  | — |  |  | — |  |  | (1.0) |  |  | — |  |  | — |
BALANCE, September 30, 2019 | 205.8 |  |  | $ | 82.5 |  |  | $ | 8,619.5 |  |  | $ | 887.7 |  |  | $ | 18.9 |  |  | $ | (77.2) |  |  | $ | (.9) |

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- Definition Schedule Of Activity In Our Various Shareholders Equity [Table Text Block] + References No definition available. + Details
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- Definition Shareholders' Equity [Abstract] + References No definition available. + Details
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