Stock-Based Compensation - Narrative (Details) $ in Millions	12 Months Ended
Dec. 31, 2017 USD ($) shares
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense (in dollars)	$ 2.4
Recognition period for unrecognized compensation expense (in years)	2 years 6 months
Restricted stock awards and units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense (in dollars)	$ 3.4
Recognition period for unrecognized compensation expense (in years)	2 years
Unvested performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	3 years
Unrecognized compensation expense (in dollars)	$ 5.5
Recognition period for unrecognized compensation expense (in years)	1 year 9 months 18 days
MFS 2016 Omnibus Incentive Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized under share based compensation plans (in shares) \| shares	13,700,000.0
Directors \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period (in years)	10 years
Directors \| Plans Prior to 2011 \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period (in years)	10 years
Vesting period (in years)	4 years
Aggregate grant value (as a percent)	25.00%
Directors \| Plans Subsequent to 2011 \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period (in years)	10 years
Vesting period (in years)	4 years
Aggregate grant value (as a percent)	25.00%
Minimum \| Unvested performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate grant value (as a percent)	0.00%
Maximum \| Unvested performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate grant value (as a percent)	200.00%

Unrecognized cost of unvested share-based compensation awards.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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No definition available.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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Percentage of vesting of share-based compensation awards.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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