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Share-Based Compensation Plans - Performance Share Units (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Payout Levels (in units): |  |  |  |
Share-based compensation | $ 27.8 | $ 28.7 | $ 27.1 |
Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Performance period range | 3 years |  |  |
Performance share units |  |  |  |
Payout Levels (in units): |  |  |  |
Threshold Award (in shares) | 47,003 | 57,563 | 65,141 | 82,298
Target Award (in shares) | 94,005 | 115,125 | 130,282 | 164,595
Outstanding Award (in shares) | 188,010 | 230,250 | 260,564 | 329,190
Shares Issued (in shares) | 219,519 |  |  |
Payout Achieved Over Performance Period (in shares) | 123,767 |  |  |
Share-based compensation | $ 8.4 | $ 10.8 | $ 9.1 |

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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 Performance term considered in granting performance share units. + References No definition available. + Details
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- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Achieved Over Performance 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 were issued during the reporting period. + 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=98514028&loc=d3e3602-108585 + Details
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