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Shareholders' Equity and Long-Term Incentive Compensation - Long-Term Incentive Compensation (Details) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Mar. 01, 2017 | Mar. 02, 2016 | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 | Dec. 31, 2013
Assumptions in determining the fair value of awards granted |  |  |  |  |  |  |
Historical period upon which annual expected stock price volatility is based |  |  | 3 years |  |  |  |
Maximum |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |
Maximum period over which the fair value of restricted stock shares and restricted stock units are amortized |  |  | 3 years |  |  |  |
Assumptions in determining the fair value of awards granted |  |  |  |  |  |  |
Daily treasury yield curve period upon which average risk-free interest rate is based |  |  | 3 years |  |  |  |
Maximum | 2002 Stock Compensation Plan |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |
Shares available for grant (in shares) | shares |  |  | 1,682,000 |  |  |  |
Maximum | Directors' Plan |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |
Shares available for grant (in shares) | shares |  |  | 27,000.000 |  |  |  |
Minimum |  |  |  |  |  |  |
Assumptions in determining the fair value of awards granted |  |  |  |  |  |  |
Daily treasury yield curve period upon which average risk-free interest rate is based |  |  | 1 year |  |  |  |
PSU's, RSU's, RS's, and Stock Options |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |
Compensation expense | $ |  |  | $ 12.0 | $ 12.7 | $ 33.9 |  |
PSU's, RSU's, and RS's | Maximum |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |  |
PSU's, RSU's, and RS's | Minimum |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |
Vesting period |  |  | 1 year |  |  |  |
Restricted stock shares and restricted stock units |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |
Related tax benefit | $ |  |  | $ 4.6 | $ 4.8 | $ 12.9 |  |
Restricted stock shares and restricted stock units | 2002 Stock Compensation Plan |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |
Reduction of shares available for grant (in shares) | shares |  |  | 2 |  |  |  |
Restricted stock shares and restricted stock units | Directors' Plan |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |
Vesting period |  |  | 1 year | 1 year | 1 year |  |
PSU's |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |
Vesting period |  |  | 3 years | 3 years | 3 years |  |
Assumptions in determining the fair value of awards granted |  |  |  |  |  |  |
Annual expected stock price volatility | 41.03% | 36.91% |  |  |  |  |
Annual expected dividend yield | 0.00% | 0.00% |  |  |  |  |
Risk-free interest rate | 1.52% | 0.97% |  |  |  |  |
Correlation between total shareholder return for SPX and the applicable S&P index | 0.3685 | 0.3354 |  |  |  |  |
PSU's | 2002 Stock Compensation Plan |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |
Reduction of shares available for grant (in shares) | shares |  |  | 3.0 |  |  |  |
PSU's | S&P Composite 1500 Industrials Index |  |  |  |  |  |  |
Assumptions in determining the fair value of awards granted |  |  |  |  |  |  |
Annual expected stock price volatility | 34.49% | 32.94% |  |  |  |  |
Risk-free interest rate | 1.52% | 0.97% |  |  |  |  |
PSU's | Maximum |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |
Maximum vesting attainment (percentage) |  |  | 150.00% |  |  |  |
Percentage of target award, which can be earned by each eligible employee |  |  |  |  |  | 125.00% | 125.00%
PSU's | Minimum |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |
Percentage of target award, which can be earned by each eligible employee |  |  |  |  |  | 25.00% | 25.00%
PSU's | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | SPX Flow, Inc |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |
Percentage of target award, which can be earned by each eligible employee |  |  | 50.00% | 50.00% |  |  |
Additional stock compensation expense | $ |  |  |  |  | $ 2.1 |  |
Long Term Cash Awards |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |  |
Compensation expense | $ |  |  | $ 3.8 | $ 1.0 |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 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=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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