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Benefit Plans | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Benefit Plans | BENEFIT PLANS Our shareholders approved the 2012 Long-Term Incentive Plan (the “2012 LTIP”) effective January 1, 2012, to provide for the issuance of non-vested share awards, share option awards and performance awards (collectively "awards"). Under the 2012 LTIP, as amended, 23.0 million shares were reserved for issuance as awards to officers, non-employee directors and key employees who are in a position to contribute materially to our growth, development and long-term success. As of December 31, 2015, there were 12.9 million shares available for issuance as awards under the 2012 LTIP. Awards may be satisfied by newly issued shares, including shares held by a subsidiary or affiliated entity, or by delivery of shares held in an affiliated employee benefit trust at the Company's discretion. Non-Vested Share Awards and Units Grants of non-vested share awards and non-vested share units generally vest at rates of 20% or 33% per year, as determined by a committee or subcommittee of the Board of Directors at the time of grant. Our non-vested share awards have voting and dividend rights effective on the date of grant, and our non-vested share units have dividend rights effective on the date of grant. Compensation expense is measured using the market value of our shares on the date of grant and is recognized on a straight-line basis over the requisite service period (usually the vesting period). The following table summarizes non-vested share award related compensation expense recognized during each of the years in the three-year period ended December 31, 2015 (in millions):
| 2015 |  | 2014 |  | 2013
Contract drilling | $ | 19.5 |  |  | $ | 20.9 |  |  | $ | 21.3 |
General and administrative | 17.8 |  |  | 20.7 |  |  | 21.6 |
Non-vested share award related compensation expense included in operating expenses | 37.3 |  |  | 41.6 |  |  | 42.9 |
Tax benefit | (4.8 | ) |  | (5.1 | ) |  | (5.4 | )
Total non-vested share award related compensation expense included in net income | $ | 32.5 |  |  | $ | 36.5 |  |  | $ | 37.5 |
The following table summarizes the value of non-vested shares granted and vested during each of the years in the three-year period ended December 31, 2015:
| 2015 |  | 2014 |  | 2013
Weighted-average grant-date fair value of non-vested share awards granted (per share) | $ | 23.95 |  |  | $ | 51.22 |  |  | $ | 59.79 |
Total fair value of non-vested share awards vested during the period (in millions) | $ | 18.0 |  |  | $ | 46.2 |  |  | $ | 49.6 |
The following table summarizes non-vested share activity for the year ended December 31, 2015 (shares in thousands):
| Shares |  | Weighted-Average Grant-Date Fair Value
Non-vested share awards as of December 31, 2014 | 2,641 |  |  | $ | 52.86 |
Granted | 2,116 |  |  | 23.95 |
Vested | (787 | ) |  | 51.42 |
Forfeited | (827 | ) |  | 41.23 |
Non-vested share awards as of December 31, 2015 | 3,143 |  |  | $ | 36.46 |
As of December 31, 2015, there was $88.2 million of total unrecognized compensation cost related to non-vested share awards and non-vested share units, which is expected to be recognized over a weighted-average period of 2.0 years. Share Option Awards Share option awards ("options") granted to officers and employees generally become exercisable in 25% increments over a four-year period or 33% increments over a three-year period and, to the extent not exercised, expire on the seventh anniversary of the date of grant. Options granted to non-employee directors are immediately exercisable and, to the extent not exercised, expire on the seventh anniversary of the date of grant. The exercise price of options granted under the 2012 LTIP equals the market value of the underlying shares on the date of grant. As of December 31, 2015, options granted to purchase 458,000 shares with a weighted average exercise price of $41.51 were outstanding under the 2012 LTIP and predecessor or acquired plans. No options have been granted since 2011, and there were no unrecognized compensation costs related to options as of December 31, 2015. Performance Awards Under the 2012 LTIP, performance awards may be issued to our senior executive officers. Performance awards granted during 2013, 2014 and 2015 are payable in Ensco shares upon attainment of specified performance goals based on relative total shareholder return ("TSR") and relative return on capital employed ("ROCE"). The performance goals are determined by a committee or subcommittee of the Board of Directors. Performance awards generally vest at the end of a three-year measurement period based on attainment of performance goals. Our performance awards are classified as equity awards with compensation expense recognized on a straight-line basis over the requisite service period. The estimated probable outcome of attainment of the specified performance goals is based on historical experience, and any subsequent changes in this estimate for the relative ROCE performance goal are recognized as a cumulative adjustment to compensation cost in the period in which the change in estimate occurs. The aggregate grant-date fair value of performance awards granted during 2015, 2014 and 2013 totaled $8.3 million, $7.4 million and $8.2 million, respectively. The aggregate fair value of performance awards vested during 2015, 2014 and 2013 totaled $4.6 million, $6.9 million and $7.4 million, respectively. During the years ended December 31, 2015, 2014 and 2013, we recognized $2.9 million, $3.4 million and $6.6 million of compensation expense for performance awards, respectively, which was included in general and administrative expense in our consolidated statements of operations. As of December 31, 2015, there was $6.3 million of total unrecognized compensation cost related to unvested performance awards, which is expected to be recognized over a weighted-average period of 2.0 years. Savings Plans We have profit sharing plans (the "Ensco Savings Plan," the "Ensco Multinational Savings Plan" and the "Ensco Limited Retirement Plan"), which cover eligible employees, as defined within each plan. The Ensco Savings Plan includes a 401(k) savings plan feature which allows eligible employees to make tax-deferred contributions to the plan. The Ensco Limited Retirement Plan also allows eligible employees to make tax-deferred contributions to the plan. Contributions made to the Ensco Multinational Savings Plan may or may not qualify for tax deferral based on each plan participant's local tax requirements. We generally make matching cash contributions to the plans. We match 100% of the amount contributed by the employee up to a maximum of 5% of eligible salary. Matching contributions totaled $18.9 million, $20.7 million and $21.1 million for the years ended December 31, 2015, 2014 and 2013, respectively. Any additional discretionary contributions made into the plans require approval of the Board of Directors and are generally paid in cash. We recorded additional discretionary contribution provisions of $27.5 million, $30.7 million and $55.3 million for the years ended December 31, 2015, 2014 and 2013, respectively. Matching contributions and additional discretionary contributions become vested in 33% increments upon completion of each initial year of service with all contributions becoming fully vested subsequent to achievement of three or more years of service. We have 1.0 million shares reserved for issuance as matching contributions under the Ensco Savings Plan.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51659978&loc=d3e25284-112666 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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