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Share-Based Compensation (Tables) - HCM Share Based Compensation Plans [Member] | 6 Months Ended
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Jun. 30, 2018
Summary of Performance Based Stock Options | Performance-based option activity under the 2007 SIP and the 2013 HCM 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, 2017 |  |  | 1,038,147 |  |  | $ | 13.46 |  |  |  | 3.5 |  |  | $ | — |
Granted |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Exercised |  |  | (546,609 | ) |  |  | (13.46 | ) |  |  | — |  |  |  | — |
Forfeited or expired |  |  | (8,358 | ) |  |  | (13.46 | ) |  |  | — |  |  |  | — |
Performance-based options outstanding at June 30, 2018 |  |  | 483,180 |  |  | $ | 13.49 |  |  |  | 3.4 |  |  | $ | 9.5 |
Performance-based options exercisable at June 30, 2018 |  |  | 483,180 |  |  | $ | 13.49 |  |  |  | 3.4 |  |  | $ | 9.5 |
Summary of Term-Based Option Activity | Term-based option activity, including stock options under the 2007 SIP, the 2013 HCM 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, 2017 |  |  | 10,994,181 |  |  | $ | 16.52 |  |  |  | 6.9 |  |  | $ | 48.8 |
Granted |  |  | 4,822,517 |  |  |  | 21.96 |  |  |  | — |  |  |  | — |
Exercised |  |  | (623,511 | ) |  |  | (13.95 | ) |  |  | — |  |  |  | — |
Forfeited or expired |  |  | (136,434 | ) |  |  | (17.10 | ) |  |  | — |  |  |  | — |
Term-based options outstanding at June 30, 2018 |  |  | 15,056,753 |  |  | $ | 18.37 |  |  |  | 7.6 |  |  | $ | 223.1 |
Term-based options exercisable at June 30, 2018 |  |  | 7,364,017 |  |  | $ | 16.48 |  |  |  | 5.8 |  |  | $ | 123.1 |
Summary of Restricted Stock Units | Restricted stock units (“RSUs”) activity, including RSUs under the 2013 HCM SIP and the 2018 EIP, for the period was as follows:
|  | Shares |
RSUs outstanding at December 31, 2017 |  |  | 605,990 |
Granted |  |  | 27,955 |
Shares issued upon vesting of RSUs |  |  | (105,990 | )
Forfeited or canceled |  |  | — |
RSUs outstanding at June 30, 2018 |  |  | 527,955 |
RSUs releasable at June 30, 2018 |  |  | 125,000 |

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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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- Details
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