Share-Based Compensation	9 Months Ended
Share-Based Compensation	Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Compensation	Share-Based Compensation On February 25, 2016, the Company granted restricted share units (“RSUs”) to employees for annual incentive awards pursuant to our long-term incentive plan with a grant-date fair value aggregating $19.3 million. The awards vest ratably over three years except to the extent they may vest earlier under our retirement policy. The aggregate grant-date fair value, net of estimated forfeitures, was $18.2 million, which will be recognized as compensation expense over a weighted-average period of 2.6 years from the grant date. Additionally, on February 25, 2016, the Company granted to certain members of management performance units (“P-Units”) that have a target value of $100 per unit. The amount ultimately earned with respect to the P-Units will depend on the Company’s total shareholder return (“TSR”) relative to a group of peer companies over a three-year period ending December 31, 2018, and could range from zero to $200 per unit depending on performance. Twenty-five percent of the P-Units’ value is determined by the Company’s relative TSR ranking for each one-year period ended December 31, 2016, 2017, and 2018, respectively, and 25% of the P-Units’ value is determined by the relative TSR ranking for the three-year period ending December 31, 2018. The P-Units cliff vest on the third anniversary following the grant date. Settlement may be in cash or shares at the Board's discretion. The grant-date fair value of the P-Units was estimated to be $8.6 million. Fair value was estimated using a Monte Carlo simulation model, which considers the probabilities of the Company’s TSR ranking at the end of each performance period and the amount of the payout at each rank to determine the probability-weighted expected payout. The Company uses liability accounting to account for the P-Units. Compensation is recognized on a straight-line basis over a maximum period of three years from the grant date and is adjusted for changes in fair value through the vesting date. Estimated liabilities for P-Units as of September 30, 2016, included $9.8 million and $10.6 million classified as current and noncurrent, respectively, compared to $7.6 million and $11.4 million, respectively, at December 31, 2015. Current and noncurrent estimated P-Unit liabilities are included in Accrued Liabilities, and Other Liabilities, respectively, in the Condensed Consolidated Balance Sheets. At September 30, 2016, estimated unrecognized share-based compensation totaled approximately $36.9 million, which is expected to be recognized as compensation expense over a remaining weighted-average period of 1.7 years.

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.