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Stock-Based Compensation Plans (Tables) | 3 Months Ended
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Mar. 31, 2012
Summary of Stock Options Issued Pursuant to Stock Incentive Plans | A summary of stock options issued pursuant to the Company’s stock incentive plans is as follows:
|  | Number of Shares |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value of In-the-Money Options |
Outstanding as of December 31, 2011 |  |  | 3,490,056 |  |  | $ | 23.28 |  |  |  |  |  |  |  |  |
Granted |  |  | 14,984 |  |  |  | 39.25 |  |  |  |  |  |  |  |  |
Exercised |  |  | (302,224 | ) |  |  | 14.55 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (24,966 | ) |  |  | 21.64 |  |  |  |  |  |  |  |  |
Expired |  |  | (1,500 | ) |  |  | 10.04 |  |  |  |  |  |  |  |  |
Outstanding as of March 31, 2012 |  |  | 3,176,350 |  |  | $ | 24.20 |  |  |  | 5.26 |  |  | $ | 51,042,035 |
Exercisable as of March 31, 2012 |  |  | 2,052,169 |  |  | $ | 23.92 |  |  |  | 4.55 |  |  | $ | 33,553,777 |
Fair Value of Options Granted Estimated Using Black-Scholes Option-Pricing Model with Weighted-Average Assumptions | The fair value of options granted during the three months ended March 31, 2012 was estimated on the date of grant using the Black-Scholes option-pricing model, a pricing model acceptable under U.S. GAAP, with the following weighted-average assumptions:
|  | Three Months Ended March 31, 2012 |
Expected life (years) |  |  | 5.55 |
Interest rate |  |  | 1.1 | %
Volatility |  |  | 51.3 | %
Dividend yield |  |  | — |
Summary of Nonvested Long-Term Incentive Program Performance Share Awards ("LTIP performance shares") Outstanding | A summary of nonvested long-term incentive program performance share awards (“LTIP performance shares”) outstanding as of March 31, 2012 and changes during the period are as follows:
Nonvested LTIP Performance Shares |  | Number of Shares at Expected Attainment |  |  | Weighted- Average Grant Date Fair Value |
Nonvested as of December 31, 2011 |  |  | 931,571 |  |  | $ | 23.33 |
Granted |  |  | 11,987 |  |  |  | 39.25 |
Forfeited |  |  | (10,426 | ) |  |  | 27.22 |
Nonvested as of March 31, 2012 |  |  | 933,132 |  |  | $ | 23.49 |
Summary of Nonvested Restricted Share Awards ("RSAs") and Changes During Period | A summary of nonvested restricted share awards (“RSAs”) as of March 31, 2012 and changes during the period are as follows:
Nonvested Restricted Share Awards |  | Number of Restricted Share Awards |  |  | Weighted-Average Grant Date Fair Value |
Nonvested as of December 31, 2011 |  |  | 100,023 |  |  | $ | 19.29 |
Vested |  |  | (37,583 | ) |  |  | 16.58 |
Forfeited |  |  | (7,250 | ) |  |  | 16.52 |
Nonvested as of March 31, 2012 |  |  | 55,190 |  |  | $ | 21.51 |
Stock Incentive Plan 2003 |
Summary of Nonvested Restricted Share Awards ("RSAs") and Changes During Period | A summary of nonvested Transaction RSAs issued under the S1 2003 Stock Incentive Plan as of March 31, 2012 and changes during the period are as follows:
Nonvested Transaction Restricted Share Awards |  | Number of Restricted Share Awards |  |  | Weighted-Average Grant Date Fair Value |
Nonvested as of December 31, 2011 |  |  | — |  |  | $ | — |
Transaction RSAs converted upon acquisition of S1 |  |  | 170,205 |  |  |  | 35.41 |
Vested |  |  | (67,857 | ) |  |  | 35.41 |
Forfeited |  |  | (747 | ) |  |  | 35.41 |
Nonvested as of March 31, 2012 |  |  | 101,601 |  |  | $ | 35.41 |

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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (c)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (c)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (c)(1) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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