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Share-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2020
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, 2019 |  |  | 68,281 |  |  | $ | 13.58 |  |  |  | 2.6 |  |  | $ | 3.7 |
Granted |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Exercised |  |  | (13,417 | ) |  |  | (13.46 | ) |  |  | — |  |  |  | — |
Forfeited or expired |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Performance-based options outstanding at March 31, 2020 |  |  | 54,864 |  |  | $ | 13.61 |  |  |  | 2.4 |  |  | $ | 2.0 |
Performance-based options exercisable at March 31, 2020 |  |  | 54,864 |  |  | $ | 13.61 |  |  |  | 2.4 |  |  | $ | 2.0 |
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, 2019 |  |  | 13,144,937 |  |  | $ | 29.74 |  |  |  | 7.8 |  |  | $ | 501.3 |
Granted |  |  | 140,447 |  |  |  | 70.73 |  |  |  | — |  |  |  | — |
Exercised |  |  | (476,489 | ) |  |  | (18.84 | ) |  |  | — |  |  |  | — |
Forfeited or expired |  |  | (51,324 | ) |  |  | (29.34 | ) |  |  | — |  |  |  | — |
Term-based options outstanding at March 31, 2020 |  |  | 12,757,571 |  |  | $ | 30.60 |  |  |  | 7.6 |  |  | $ | 251.6 |
Term-based options exercisable at March 31, 2020 |  |  | 4,668,339 |  |  | $ | 25.02 |  |  |  | 6.5 |  |  | $ | 116.9 |
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, 2019 |  |  | 819,818 |
Granted |  |  | 60,325 |
Shares issued upon vesting of RSUs |  |  | (12,500 | )
Forfeited or canceled |  |  | (54 | )
RSUs outstanding at March 31, 2020 |  |  | 867,589 |
RSUs releasable at March 31, 2020 |  |  | 395,338 |

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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=116856206&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=116856206&loc=d3e5070-113901 + Details
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