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SHAREHOLDERS' EQUITY | 6 Months Ended
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Jun. 30, 2017
Stockholders' Equity Note [Abstract] |
SHAREHOLDERS' EQUITY | The following table presents our common shares issued and outstanding:
|  | Three months ended June 30, |  | Six months ended June 30, |
|  | 2017 |  | 2016 |  | 2017 |  | 2016 |
| Shares issued, balance at beginning of period | 176,580 |  |  | 176,556 |  |  | 176,580 |  |  | 176,240 |  |
| Shares issued | — |  |  | 19 |  |  | — |  |  | 335 |  |
| Total shares issued at end of period | 176,580 |  |  | 176,575 |  |  | 176,580 |  |  | 176,575 |  |
| Treasury shares, balance at beginning of period | (91,410 | ) |  | (83,653 | ) |  | (90,139 | ) |  | (80,174 | ) |
| Shares repurchased | (2,004 | ) |  | (2,337 | ) |  | (4,233 | ) |  | (6,247 | ) |
| Shares reissued from treasury | 37 |  |  | 69 |  |  | 995 |  |  | 500 |  |
| Total treasury shares at end of period | (93,377 | ) |  | (85,921 | ) |  | (93,377 | ) |  | (85,921 | ) |
| Total shares outstanding | 83,203 |  |  | 90,654 |  |  | 83,203 |  |  | 90,654 |  |
Treasury Shares The following table presents our share repurchases:
|  | Three months ended June 30, |  | Six months ended June 30, |
|  | 2017 |  | 2016 |  | 2017 |  | 2016 |
| In the open market: |  |  |  |  |  |  |  |
| Total shares(1) | 1,987 |  |  | 2,300 |  |  | 3,883 |  |  | 6,004 |  |
| Total cost | $ | 129,960 |  |  | $ | 125,000 |  |  | $ | 257,943 |  |  | $ | 310,000 |  |
| Average price per share(2) | $ | 65.40 |  |  | $ | 54.35 |  |  | $ | 66.44 |  |  | $ | 51.63 |  |
| From employees:(3) |  |  |  |  |  |  |  |
| Total shares | 17 |  |  | 37 |  |  | 350 |  |  | 243 |  |
| Total cost | $ | 1,110 |  |  | $ | 2,039 |  |  | $ | 24,370 |  |  | $ | 13,050 |  |
| Average price per share(2) | $ | 64.82 |  |  | $ | 54.70 |  |  | $ | 69.55 |  |  | $ | 53.65 |  |
| Total shares repurchased: |  |  |  |  |  |  |  |
| Total shares | 2,004 |  |  | 2,337 |  |  | 4,233 |  |  | 6,247 |  |
| Total cost | $ | 131,070 |  |  | $ | 127,039 |  |  | $ | 282,313 |  |  | $ | 323,050 |  |
| Average price per share(2) | $ | 65.40 |  |  | $ | 54.36 |  |  | $ | 66.69 |  |  | $ | 51.71 |  |
(1) | The six months ended June 30 2016 includes 1,358,380 common shares acquired under the accelerated share repurchase program (see below for more detail).
(2) | Calculated using whole numbers.
(3) | To satisfy withholding tax liabilities upon the vesting of restricted stock and restricted stock units.
Accelerated Share Repurchase Program On August 17, 2015, the Company entered into an Accelerated Share Repurchase agreement with Goldman, Sachs & Co. (“Goldman Sachs”) to repurchase an aggregate of $300 million of the Company’s ordinary shares under an accelerated share repurchase program. During August, 2015, under the terms of this agreement, the Company paid $300 million to Goldman Sachs and initially repurchased 4,149,378 ordinary shares. The initial shares acquired represented 80% of the $300 million total paid to Goldman Sachs and were calculated using the Company’s stock price at activation of the program. The ASR program is accounted for as an equity transaction. Accordingly, at December 31, 2015, $240 million of common shares repurchased were included as treasury shares in the Consolidated Balance Sheet with the remaining $60 million included as a reduction to additional paid-in capital. On January 15, 2016, Goldman Sachs early terminated the ASR agreement and delivered 1,358,380 additional common shares to the Company, resulting in the reduction from additional paid-in capital of $60 million being reclassified to treasury shares. In total, the Company repurchased 5,507,758 common shares under the ASR agreement at an average price of $54.47. Preferred Shares On April 17, 2017, the Company redeemed the remaining 14,042,955 of its 6.875% Series C preferred shares, for an aggregate liquidation preference of $351 million.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Preferred Stock -URI http://asc.fasb.org/extlink&oid=6521494 Reference 15: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 16: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 + Details
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