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Consolidated Statements Of Shareholders' Equity - USD ($) $ in Millions | Total | Common Stock [Member] | Paid-In Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | --- | ---
Balance, shares at at Dec. 31, 2013 |  | 22,943,078 |  |  |
Balance at at Dec. 31, 2013 | $ 750.1 | $ 0.2 | $ 63.2 | $ 686.9 | $ (0.2)
Net income | 266.2 | 0.0 | 0.0 | 266.2 | 0.0
Other comprehensive income (loss) | 0.1 | 0.0 | 0.0 | 0.0 | 0.1
Stock-based compensation | $ 15.3 | $ 0.0 | 15.3 | 0.0 | 0.0
Restricted stock awards, net of forfeitures, shares |  | 5,462 |  |  |
Repurchase of common stock, shares | (2,686,744) | (2,686,744) |  |  |
Repurchase of common stock | $ (343.7) | $ 0.0 | (4.0) | (339.7) | 0.0
Restricted stock units converted to common stock, shares |  | 300,875 |  |  |
Stock options exercised, shares |  | 35,000 |  |  |
Stock options exercised | 0.6 | $ 0.0 | 0.6 | 0.0 | 0.0
Tax benefits from stock-based compensation plans | 13.6 | $ 0.0 | 13.6 | 0.0 | 0.0
Balance, shares at at Dec. 31, 2014 |  | 20,597,671 |  |  |
Balance at at Dec. 31, 2014 | 702.2 | $ 0.2 | 88.7 | 613.4 | (0.1)
Net income | 299.7 | 0.0 | 0.0 | 299.7 | 0.0
Stock-based compensation | $ 12.4 | $ 0.0 | 12.4 | 0.0 | 0.0
Restricted stock awards, net of forfeitures, shares |  | 4,024 |  |  |
Repurchase of common stock, shares | (470,071) | (470,071) |  |  |
Repurchase of common stock | $ (86.5) | $ 0.0 | (0.6) | (85.9) | 0.0
Restricted stock units converted to common stock, shares |  | 1,348 |  |  |
Tax benefits from stock-based compensation plans | $ 0.3 | $ 0.0 | 0.3 | 0.0 | 0.0
Balance, shares at at Dec. 31, 2015 | 20,132,972 | 20,132,972 |  |  |
Balance at at Dec. 31, 2015 | $ 928.1 | $ 0.2 | 100.8 | 827.2 | (0.1)
Net income | 332.8 | 0.0 | 0.0 | 332.8 | 0.0
Other comprehensive income (loss) | (0.1) | 0.0 | 0.0 | 0.0 | (0.1)
Stock-based compensation | $ 7.4 | $ 0.0 | 7.4 | 0.0 | 0.0
Restricted stock awards, net of forfeitures, shares |  | 6,643 |  |  |
Repurchase of common stock, shares | (666,330) | (666,330) |  |  |
Repurchase of common stock | $ (121.7) | $ 0.0 | (3.7) | (118.0) | 0.0
Restricted stock units converted to common stock, shares |  | 404,096 |  |  |
Tax benefits from stock-based compensation plans | $ 27.2 | $ 0.0 | 27.2 | 0.0 | 0.0
Balance, shares at at Dec. 31, 2016 | 19,877,381 | 19,877,381 |  |  |
Balance at at Dec. 31, 2016 | $ 1,173.7 | $ 0.2 | $ 131.7 | $ 1,042.0 | $ (0.2)

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- Definition This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415241&loc=d3e4534-113899 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11149-113907 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11178-113907 + Details
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- Definition Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6419406&loc=d3e23524-113945 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 + Details
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