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Share-Based Compensation Plans - Performance Share Units (Details) - USD ($) $ in Millions |  |  | 12 Months Ended | 35 Months Ended
--- | --- | --- | --- | ---
Oct. 29, 2014 | Feb. 14, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015
Payout Levels (in units): |  |  |  |  |  |
Share-based compensation |  |  | $ 31.1 | $ 40.6 | $ 31.5 |
Performance share units |  |  |  |  |  |
Payout Levels (in units): |  |  |  |  |  |
Threshold Award (in shares) |  |  | 82,298 | 94,608 | 76,120 |
Target Award (in shares) |  |  | 164,595 | 189,215 | 152,240 |
Outstanding Award (in shares) |  |  | 329,190 | 378,430 | 304,480 |
Shares Issued in 2015 (in shares) |  |  | 0 | 0 | 54,617 |
Shares Subject to Holding Period (in shares) |  |  | 0 | 0 | 46,623 |
Percentage of the target award level achieved over the performance period |  |  |  |  | 140.00% | 124.00%
Granted (in shares) | 3,046 | 7,610 |  |  |  |
Share-based compensation |  |  | $ 17.1 | $ 20.1 | $ 13.1 |
Performance share units | February 11, 2014 and May 1, 2014 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage |  |  |  | 100.00% |  |
Performance share units | February 11, 2015 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage |  |  | 100.00% |  |  |
Performance share units | December 31, 2014 | February 14, 2013 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage |  |  |  |  | 50.00% |
Performance share units | December 31, 2015 | February 14, 2013 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage |  |  |  |  | 50.00% |
Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Performance period range |  |  | 1 year |  |  |
Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Performance period range |  |  | 3 years |  |  |

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- Definition In the event the performance criteria exceeds the target performance level, an additional number of shares, up to the Outstanding Award level, may be granted. + References No definition available. + Details
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- Definition Number of shares under an equity-based award plan, other than a stock option plan, that were issued during the reporting period. + References No definition available. + Details
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- Definition Number of shares under an equity-based award plan, other than a stock option plan, that are subject to holding. + References No definition available. + Details
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- Definition In the event the performance criteria meets the target performance level, the number of shares, up to the Target Award level, may be granted. + References No definition available. + Details
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- Definition In the event the performance criteria falls below the target performance level, a reduced number of shares, as low as the Threshold Award level, may be granted. + References No definition available. + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + 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 + Details
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- Definition Percentage of vesting of share-based compensation awards. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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