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Stock-Based Compensation (Details 4) (Management Stock Purchase Plan, Restricted stock units (RSUs), USD $) In Millions, except Share data in Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Management Stock Purchase Plan | Restricted stock units (RSUs) |  |  |
RSU activity and related information |  |  |
Outstanding at beginning of period (in shares) | 392 | 361 | 350
Granted (in shares) | 64 | 99 | 159
Cancelled/Forfeitures (in shares) | (110) | (10) | (21)
Settled (in shares) | (150) | (58) | (127)
Outstanding at end of period (in shares) | 196 | 392 | 361
Vested at end of period (in shares) | 81 | 157 | 105
Weighted Average Purchase Price |  |  |
Outstanding at beginning of period (in dollars per share) | $ 18.74 | $ 16.92 | $ 18.13
Granted (in dollars per share) |  | $ 25.15 | $ 19.87
Cancelled/Forfeitures (in dollars per share) |  | $ 20.92 | $ 16.68
Settled (in dollars per share) |  | $ 18.01 | $ 23.95
Outstanding at end of period (in dollars per share) | $ 22.88 | $ 18.74 | $ 16.92
Vested at end of period (in dollars per share) | $ 20.36 | $ 15.57 | $ 15.21
Weighted Average Intrinsic Value |  |  |
Outstanding at end of period (in dollars per share) | $ 20.11 |  |
Vested at end of period (in dollars per share) | $ 22.63 |  |
Aggregate intrinsic value of outstanding awards | $ 3.9 |  |
Aggregate intrinsic value of awards vested | 1.8 |  |
Aggregate intrinsic value of awards settled | $ 3.8 | $ 1.2 | $ 0.7

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(e) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(c) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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