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Equity Awards - Restricted Shares Activity Table (Details) (USD $)
9 Months Ended 3 Months Ended
Sep. 30, 2014
Restricted Shares [Member]
Mar. 31, 2014
Plan 1 [Member]
Service-based restriced shares [Member]
Mar. 31, 2014
Plan 3 [Member]
Service-based restriced shares [Member]
Mar. 31, 2014
Plan 3 [Member]
Performance-based restriced shares [Member]
Mar. 31, 2014
Plan 3 [Member]
Restricted Shares [Member]
Sep. 30, 2014
Plan 6 [Member]
Service-based restriced shares [Member]
Mar. 31, 2014
2012 & 2013 EPS CAGR metric [Member]
Plan 4 [Member]
Performance-based restriced shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Award percentage attained             125.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]              
Number of Unvested Restricted Shares Outstanding, beginning balance 654,400            
Number of Unvested Restricted Shares Granted 352,082 23,226 121,562,000 121,562,000 243,124 600 16,054
Number of Unvested Restricted Shares Vested (251,647)            
Number of Unvested Restricted Shares Cancelled (10,856)            
Number of Unvested Restricted Shares Outstanding, ending balance 743,979            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]              
Unvested Restricted Shares Outstanding, Weighted Average Grant Date Fair Value, beginning $ 26.00            
Unvested Restricted Shares Granted, Weighted Average Grant Date Fair Value $ 33.23            
Unvested Restricted Shares Vested, Weighted Average Grant Date Fair Value $ 25.71            
Unvested Restricted Shares Cancelled, Weighted Average Grant Date Fair Value $ 28.24            
Unvested Restricted Shares Outstanding, Weighted Average Grant Date Fair Value, ending $ 29.49            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures              
Restricted Shares Average Remaining Contractual Life (Years) 1 year 2 months            
Restricted Shares Aggregate Intrinsic Value $ 18,101,009