Stock-Based Compensation Performance Share Units Activity (Details)	9 Months Ended
	Sep. 30, 2016 $ / shares shares
PSU
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding, shares, beginning of period (shares) | shares	106,964
Granted (shares) | shares	295,390	[1]
Vested (shares) | shares	(55,720)
Forfeited (shares) | shares	(8,096)
Outstanding and nonvested, shares, end of period (shares) | shares	343,747
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding, weighted average fair value, beginning of period (usd per share) | $ / shares	$ 65.50
Granted, weighted average fair value (usd per share) | $ / shares	21.26	[1]
Vested, weighted average fair value (usd per share) | $ / shares	65.06
Forfeited, weighted average fair value (usd per share) | $ / shares	49.85
Outstanding and nonvested, weighted average fair value, end of period (usd per share) | $ / shares	$ 27.66
PSU Dividend Equivalent Unit (DEU)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted (shares) | shares	6,417
Dividend equivalent units vested (shares) | shares	(1,009)
Dividend equivalent units forfeited (shares) | shares	(199)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Granted, weighted average fair value (usd per share) | $ / shares	$ 39.05
Dividend equivalent units vested, weighted average fair value (usd per share) | $ / shares	41.64
Dividend equivalent units forfeited, weighted average fair value (usd per share) | $ / shares	$ 39.79
Supplemental Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted (shares) | shares	214,416
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Granted, weighted average fair value (usd per share) | $ / shares	$ 16.13	[1]

[1] Represents shares of PSUs for which performance targets have been established and which are deemed granted under U.S. GAAP. Includes 214,416 Supplemental PSUs with an average fair value of $16.13 which was determined using a Monte Carlo simulation model, as further described above.