Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

HCM Share Based Compensation Plans [Member]

Summary of Performance Based Stock Options

Performance-based option activity for the period the period is as follows:

	Shares			Weighted Average  Exercise  Price (per share)			Weighted Average  Remaining  Contractual Term  (in years)		Aggregate Intrinsic Value (in millions)
Options outstanding at December 31, 2017		1,035,647		$	13.46			3.5	$	—
Granted		—			—			—		—
Exercised		—			—			—		—
Forfeited or expired		(5,572	)		(13.46	)		—		—
Options outstanding at March 31, 2018		1,030,075		$	13.46			3.2	$	—

Summary of Term-Based Option Activity

Term-based option activity for the period is as follows:

	Shares			Weighted Average  Exercise  Price  (per share)			Weighted Average  Remaining  Contractual Term  (in years)		Aggregate Intrinsic Value (in millions)
Options outstanding at December 31, 2017		10,991,681		$	16.52			6.9	$	48.8
Granted		175,000			20.96			—		—
Exercised		(17,357	)		(19.76	)		—		—
Forfeited or expired		(41,988	)		(17.38	)		—		—
Options outstanding at March 31, 2018		11,107,336		$	16.59			6.7	$	48.5
Options exercisable at March 31, 2018		7,214,169		$	16.19			5.6	$	34.4

Summary of Restricted Stock Units

Restricted stock units (“RSUs”) activity for the period is as follows.

	Shares
RSUs outstanding at December 31, 2017		605,990
Granted		—
Shares issued upon vesting of RSUs		(76,190	)
Forfeited or canceled		—
RSUs outstanding at March 31, 2018		529,800
RSUs releasable at March 31, 2018		125,000

Class C Stock Option [Member] | Joint Venture Share Based Compensation Plans [Member]

Summary of Stock Option Activity

Class C stock option activity for the period is as follows:

	Shares			Weighted Average  Exercise  Price  (per share)			Weighted Average  Remaining  Contractual Term  (in years)		Aggregate Intrinsic Value (in millions)
Options outstanding at December 31, 2017		1,104,474		$	2.44			6.9	$	3.0
Granted		31,416			3.90			—		—
Exercised		—			—			—		—
Forfeited or expired		(21,590	)		(4.57	)		—		—
Options outstanding at March 31, 2018		1,114,300		$	2.44			6.7	$	3.1
Options exercisable at March 31, 2018		624,820		$	1.74			6.5	$	2.2

ClassD Stock Option [Member] | Joint Venture Share Based Compensation Plans [Member]

Summary of Stock Option Activity

Class D stock option activity for the period is as follows:

	Shares			Weighted Average  Exercise  Price  (per share)			Weighted Average  Remaining  Contractual Term  (in years)		Aggregate Intrinsic Value (in millions)
Options outstanding at December 31, 2017		986,525		$	8.60			5.8	$	1.0
Granted		31,414			7.91			—		—
Exercised		—			—			—		—
Forfeited or expired		(26,200	)		(8.83	)		—		—
Options outstanding at March 31, 2018		991,739		$	8.57			5.5	$	1.1
Options exercisable at March 31, 2018		404,014		$	8.58			5.5	$	0.4