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Shareholders' Equity Shareholders' Equity | 3 Months Ended
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Mar. 31, 2019
Shareholders' Equity [Abstract] |
Shareholders' Equity and Share-based Payments [Text Block] | Shareholders' Equity Activity in our various shareholders' equity accounts for the three-month periods ended March 31, 2019 and 2018 were as follows (in millions):
| 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 | )
| 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 | — |  |  | — |  |  | — |  |  | (140.1 | ) |  | — |  |  | — |  |  | (.4 | )
Dividends paid ($0.04 per share) | — |  |  | — |  |  | — |  |  | (4.4 | ) |  | — |  |  | — |  |  | — |
Cumulative-effect due to ASU 2018-02 | — |  |  | — |  |  | — |  |  | (.8 | ) |  | .8 |  |  | — |  |  | — |
Shares issued under share-based compensation plans, net | — |  |  | — |  |  | (.1 | ) |  | — |  |  | — |  |  | .1 |  |  | — |
Repurchase of shares | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (1.1 | ) |  | — |
Share-based compensation cost | — |  |  | — |  |  | 7.5 |  |  | — |  |  | — |  |  | — |  |  | — |
Net other comprehensive loss | — |  |  | — |  |  | — |  |  | — |  |  | (.4 | ) |  | — |  |  | — |
BALANCE, March 31, 2018 | 111.8 |  |  | $ | 44.8 |  |  | $ | 7,202.4 |  |  | $ | 1,387.4 |  |  | $ | 29.0 |  |  | $ | (70.0 | ) |  | $ | (2.5 | )
In connection with the Rowan Transaction, on April 11, 2019, we issued 88.3 million Class A Ordinary shares with an aggregate value of $1.4 billion. See "Note 3 - Rowan Transaction" for additional information. Additionally, on April 11, 2019, we effected a four-for-one reverse stock split. See "Note 14 - Subsequent Events" for additional information.

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- Definition Shareholders' Equity [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for accounts comprising shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income, and compensation-related costs for equity-based compensation. Includes, but is not limited to, disclosure of policies, compensation plan details, equity-based arrangements to obtain goods and services, deferred compensation arrangements, and employee stock purchase plan details. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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