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Share-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Performance-Based Option Activity | Performance-based option activity under the 2007 SIP and the 2013 SIP for the period was as follows:
|  | Shares |  |  | Weighted Average Exercise Price (per share) |  |  | Weighted Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value (in millions) |
Performance-based options outstanding at December 31, 2018 |  |  | 366,377 |  |  | $ | 13.50 |  |  |  | 3.1 |  |  | $ | 7.7 |
Granted |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Exercised |  |  | (43,849 | ) |  |  | (13.64 | ) |  |  | — |  |  |  | — |
Forfeited or expired |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Performance-based options outstanding at March 31, 2019 |  |  | 322,528 |  |  | $ | 13.48 |  |  |  | 2.9 |  |  | $ | 12.2 |
Performance-based options exercisable at March 31, 2019 |  |  | 322,528 |  |  | $ | 13.48 |  |  |  | 2.9 |  |  | $ | 12.2 |
Summary of Term-Based Option Activity | Term-based option activity, including stock options under the 2007 SIP, the 2013 SIP and the 2018 EIP, for the period was as follows:
|  | Shares |  |  | Weighted Average Exercise Price (per share) |  |  | Weighted Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value (in millions) |
Term-based options outstanding at December 31, 2018 |  |  | 13,549,769 |  |  | $ | 19.28 |  |  |  | 7.5 |  |  | $ | 206.8 |
Granted |  |  | 4,112,295 |  |  |  | 49.66 |  |  |  | — |  |  |  | — |
Exercised |  |  | (1,186,362 | ) |  |  | (16.69 | ) |  |  | — |  |  |  | — |
Forfeited or expired |  |  | (45,530 | ) |  |  | (21.22 | ) |  |  | — |  |  |  | — |
Term-based options outstanding at March 31, 2019 |  |  | 16,430,172 |  |  | $ | 26.83 |  |  |  | 8.1 |  |  | $ | 402.1 |
Term-based options exercisable at March 31, 2019 |  |  | 4,960,532 |  |  | $ | 16.84 |  |  |  | 5.6 |  |  | $ | 170.9 |
Summary of Restricted Stock Units Activity | Restricted stock units (“RSUs”) activity, including RSUs under the 2013 SIP and the 2018 EIP, for the period was as follows:
| Shares |
RSUs outstanding at December 31, 2018 |  | 664,073 |
Granted |  | 50,000 |
Shares issued upon vesting of RSUs |  | — |
Forfeited or canceled |  | — |
RSUs outstanding at March 31, 2019 |  | 714,073 |
RSUs releasable at March 31, 2019 |  | 250,000 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of number and weighted-average grant date fair value for nonvested performance shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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