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Shareholders' Equity and Long-Term Incentive Compensation - Stock Activity (Details) - USD ($) shares in Thousands, $ in Millions				12 Months Ended
	Feb. 21, 2019	Feb. 22, 2018	Mar. 01, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stock Options
Historical period upon which annual expected stock price volatility is based (years)				3 years
Maximum
Stock Options
Daily treasury yield curve period upon which average risk-free interest rate is based (years)				3 years
PSU's, RSU's, and RS's
Unvested Restricted Stock Shares and Restricted Stock Units
Outstanding at the beginning of the period (in shares)				652	1,230	1,702
Granted (in shares)				430	211	252
Vested (in shares)				(446)	(753)	(483)
Forfeited (in shares)				(30)	(36)	(241)
Outstanding at the end of the period (in shares)				606	652	1,230
Weighted-Average Grant-Date Fair Value
Outstanding at the beginning of the period (in dollars per share)				$ 24.65	$ 17.41	$ 16.47
Granted (in dollars per share)				35.49	33.69	28.22
Vested (in dollars per share)				18.75	15.39	18.17
Forfeited (in dollars per share)				35.10	22.35	20.83
Outstanding at the end of the period (in dollars per share)				$ 36.17	$ 24.65	$ 17.41
Unrecognized compensation cost
Unrecognized compensation cost related to PSUs, RSUs, and RSs				$ 9.9
PSU's, RSU's, and RS's | Maximum
Stock Options
Vesting period (years)				3 years
PSU's, RSU's, and RS's | Weighted Average
Unrecognized compensation cost
Weighted-average period over which unrecognized compensation costs will be recognized				1 year 10 months 24 days
Stock options
Stock Options
Granted (in shares)	186	184	208	189	184	208
Exercise price per share (in dollars per share)	$ 36.51	$ 32.69	$ 27.40	$ 36.50	$ 32.69	$ 27.40
Fair value of stock option grants (in dollars per share)	$ 13.31	$ 11.66	$ 9.60
Annual expected stock price volatility	32.70%	31.14%	32.00%
Annual expected dividend yield	0.00%	0.00%	0.00%
Risk-free interest rate	2.53%	2.75%	2.14%
Expected life of stock option (in years)	6 years	6 years	6 years
Historical period upon which annual expected stock price volatility is based (years)		6 years
Vesting period (years)		3 years
Stock option activity, Shares
Options outstanding and exercisable at the beginning of the period (in shares)				1,718	1,608	1,552
Exercised (in shares)				(202)	(64)	(125)
Forfeited (in shares)				(13)	(10)	(27)
Granted (in shares)	186	184	208	189	184	208
Options outstanding and exercisable at the end of the period (in shares)				1,692	1,718	1,608
Stock option activity, Weighted Average Exercise Price
Options outstanding and exercisable, beginning balance (in dollars per share)				$ 16.58	$ 14.67	$ 12.89
Exercised, Weighted Average Grant Date Fair Value (in dollars per share)				13.46	13.89	20.67
Forfeited, Weighted Average Exercise Price (in dollars per share)				33.15	23.17	14.45
Granted, Weighted Average Exercise Price (in dollars per share)	$ 36.51	$ 32.69	$ 27.40	36.50	32.69	27.40
Options outstanding and exercisable, ending balance (in dollars per share)				$ 19.05	$ 16.58	$ 14.67
Number of stock options exercisable (in shares)				1,329
Compensation costs not yet recognized				$ 1.5
Stock options | Maximum
Stock Options
Maximum contractual term (years)				10 years
Daily treasury yield curve period upon which average risk-free interest rate is based (years)		7 years
Stock options | Weighted Average
Unrecognized compensation cost
Weighted-average period over which unrecognized compensation costs will be recognized				1 year 10 months 24 days

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