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LONG-TERM INCENTIVE EMPLOYEE COMPENSATION | 3 Months Ended
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Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
LONG-TERM INCENTIVE EMPLOYEE COMPENSATION | LONG-TERM INCENTIVE EMPLOYEE COMPENSATION Our long-term incentive plan (LTIP) costs are primarily recorded within general and administrative expenses. The following table provides the components of LTIP costs for the three months ended March 31, 2018 and 2017.
For the Three Months Ended March 31 | 2018 |  | 2017
Equity-based awards | $ | 4.5 |  |  | $ | 3.7 |
Liability-based awards | 0.1 |  |  | 0.5 |
Total share-based compensation expense | $ | 4.6 |  |  | $ | 4.2 |
At March 31, 2018, there was $28.7 of total unrecognized compensation cost related to non-vested equity awards. This cost is expected to be recognized ratably over a weighted-average period of 2.1 years. Additionally, unrecognized compensation cost related to liability-based awards was $4.3, which is expected to be recognized ratably over a weighted-average period of 2.2 years. Year-to-Date 2018 LTIP Activity The majority of our LTIP awards are granted during the first quarter of each year and vest on the completion of a three-year service period. During the three months ended March 31, 2018, we granted the following LTIP awards as provided in the table below:
| # of Awards Granted | Weighted Average Grant Date Fair Value Per Share
Restricted stock units (RSUs) | 0.2 |  | $ | 53.00 |  |
Performance stock units (PSUs) | 0.1 |  | $ | 57.92 |  |
During the three months ended March 31, 2018 and 2017, 0.1 and 0.3 non-qualified stock options were exercised resulting in proceeds of $0.6 and $5.9, respectively. During both the three months ended March 31, 2018 and 2017, RSUs of 0.1 vested and were issued, respectively. During the three months ended March 31, 2018, PSUs of 0.1 that vested on December 31, 2017 were issued. There were no PSUs that vested on December 31, 2016 because the minimum performance requirements were not met.

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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 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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