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Long-Term Equity Compensation (Summary of Restricted Stock Units and Performance Stock Units) (Details)
12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Outstanding beginning balance, Number of Restricted Stock Units and Performance Share Units | shares 1,724,295
Granted, Number of Restricted Stock Units and Performance Share Units | shares 701,069
Vested, Number of Restricted Stock Units and Performance Share Units | shares (807,626)
Forfeited, Number of Restricted Stock Units and Performance Share Units | shares (68,002)
Outstanding ending balance, Number of Restricted Stock Units and Performance Share Units | shares 1,549,736
Outstanding beginning balance, Weighted Average Grant-Date Fair Value $ 30.82
Granted, Weighted Average Grant-Date Fair Value 57.98
Vested,Weighted Average Grant-Date Fair Value 31.36
Forfeited, Weighted Average Grant-Date Fair Value 31.26
Outstanding ending balance, Weighted Average Grant-Date Fair Value 42.80
Outstanding beginning balance, Weighted Average Purchase Price 0.000
Granted, Weighted Average Purchase Price 0.000
Vested, Weighted Average Purchase Price 0.000
Forfeited, Weighted Average Purchase Price 0.000
Outstanding ending balance, Weighted Average Purchase Price $ 0.000
Outstanding, Weighted Average Remaining Contractual Term (Years) 9 months 22 days
Outstanding, Aggregated Intrinsic Value | $ $ 106,094,927
Expected to vest, Number of Restricted Stock Units and Performance Share Units | shares 1,474,095
Expected to vest, Weighted Average Grant-Date Fair Value $ 42.77
Expected to vest, Weighted Average Purchase Price $ 0.000
Expected to vest, Weighted Average Remaining Contractual Term (Years) 10 months 6 days
Expected to vest, Aggregate Intrinsic Value | $ $ 100,916,537