Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Restricted Stock Awards and Stock Options

For restricted stock awards and stock options, we had:

	Three Months Ended
	March 31,
	2018		2017
	(In millions)
Recognized stock compensation expense	$	4.6	$	2.6
Capitalized stock compensation cost for our oil and natural gas properties	1.3		0.4
Tax benefit on stock based compensation	1.1		1.0

Schedule of Fair Value of the Restricted Stock Awards Granted During the Periods

This table shows the fair value of restricted stock awards granted to employees and non-employee directors during the periods indicated:

	Three Months Ended						Three Months Ended
	March 31, 2018						March 31, 2017
	Time Vested			Performance Vested			Time Vested			Performance Vested
Shares granted:
Employees	839,498			362,070			461,799			152,373
Non-employee directors	—			—			—			—
	839,498			362,070			461,799			152,373
Estimated fair value (in millions):(1)
Employees	$	16.1		$	7.3		$	11.4		$	4.0
Non-employee directors	—			—			—			—
	$	16.1		$	7.3		$	11.4		$	4.0
Percentage of shares granted expected to be distributed:
Employees	95		%	63		%	94		%	105		%
Non-employee directors	N/A			N/A			N/A			N/A

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(1) Represents 100% of the grant date fair value. (We recognize the grant date fair value minus estimated forfeitures.)