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Consolidated Statements of Shareholders' Equity (USD $) In Millions, except Share data, unless otherwise specified | Total | Common Stock [Member] | Additional Paid-In Capital [Member] | Retained Earnings [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | ---
BALANCE, Amount at Dec. 31, 2010 | $ 2,078.9 | $ 1.6 | $ 2.0 | $ 2,365.2 | $ (289.9)
BALANCE, Shares at Dec. 31, 2010 |  | 163,562,149 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 281.4 |  |  | 281.4 |
Repurchases of common stock | (584.9) |  |  |  | (584.9)
Stock-based compensation expense | 18.4 |  | 18.4 |  |
Shares awarded under stock-based compensation plans, including excess income tax benefit of $10.0 in 2013, $10.6 in 2012, and $22.8 in 2011 | 100.8 |  | (0.8) |  | 101.6
BALANCE, Amount at Dec. 31, 2011 | 1,894.6 | 1.6 | 19.6 | 2,646.6 | (773.2)
BALANCE, Shares at Dec. 31, 2011 |  | 163,562,149 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 316.4 |  |  | 316.4 |
Repurchases of common stock | (582.3) |  |  |  | (582.3)
Stock-based compensation expense | 18.6 |  | 18.6 |  |
Shares awarded under stock-based compensation plans, including excess income tax benefit of $10.0 in 2013, $10.6 in 2012, and $22.8 in 2011 | 41.2 |  | (11.6) |  | 52.8
BALANCE, Amount at Dec. 31, 2012 | 1,688.5 | 1.6 | 26.6 | 2,963.0 | (1,302.7)
BALANCE, Shares at Dec. 31, 2012 |  | 163,562,149 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 374.9 |  |  | 374.9 |
Repurchases of common stock | (55.7) |  |  |  | (55.7)
Stock-based compensation expense | 21.3 |  | 21.3 |  |
Shares awarded under stock-based compensation plans, including excess income tax benefit of $10.0 in 2013, $10.6 in 2012, and $22.8 in 2011 | 32.7 |  | (5.1) |  | 37.8
BALANCE, Amount at Dec. 31, 2013 | $ 2,061.7 | $ 1.6 | $ 42.8 | $ 3,337.9 | $ (1,320.6)
BALANCE, Shares at Dec. 31, 2013 |  | 163,562,149 |  |  |

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A3 -Appendix A Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=6228006&loc=d3e74512-122707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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