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Shareholders' Equity and Long-Term Incentive Compensation - Long-Term Incentive Compensation (Details) - USD ($) $ in Millions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 20, 2020 | Feb. 21, 2019 | Feb. 22, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Assumptions in determining the fair value of awards granted |  |  |  |  |  |
Historical period upon which annual expected stock price volatility is based (years) |  |  |  | 3 years |  |
Minimum |  |  |  |  |  |
Assumptions in determining the fair value of awards granted |  |  |  |  |  |
Daily treasury yield curve period upon which average risk-free interest rate is based (years) |  |  |  | 1 year |  |
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 (years) |  |  |  | 3 years |  |
2019 Stock Compensation Plan | Maximum |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |
Shares available for grant (in shares) |  |  |  | 4,407,000 |  |
Directors' Plan | Maximum |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |
Shares available for grant (in shares) |  |  |  | 27,000.000 |  |
PSU's, RSU's, RS's, and Stock Options |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |
Compensation expense |  |  |  | $ 12.8 | $ 10.8 | $ 11.6
PSU's, RSU's, and RS's | Minimum |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |
Vesting period (years) |  |  |  | 1 year |  |
PSU's, RSU's, and RS's | Maximum |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |
Vesting period (years) |  |  |  | 3 years |  |
Restricted stock shares and restricted stock units |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |
Related tax benefit |  |  |  | $ 2.2 | $ 2.6 | 2.8
Restricted stock shares and restricted stock units | 2019 Stock Compensation Plan |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |
Reduction of shares available for grant (in shares) |  |  |  | 2 |  |
Restricted stock shares and restricted stock units | Directors' Plan |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |
Vesting period (years) |  |  |  | 1 year |  |
PSU's |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |
Vesting period (years) |  |  |  | 3 years |  |
Assumptions in determining the fair value of awards granted |  |  |  |  |  |
Annual Expected Stock Price Volatility |  | 32.70% | 42.25% | 29.47% |  |
Annual Expected Dividend Yield |  | 0.00% | 0.00% | 0.00% |  |
Risk-Free Interest Rate |  | 2.53% | 2.38% | 1.35% |  |
Correlation Between Total Shareholder Return for SPX and the Applicable S&P Index |  | 0.3875 | 0.3267 | 0.3547 |  |
PSU's | Peer group within S&P 600 Capital Goods Index |  |  |  |  |  |
Assumptions in determining the fair value of awards granted |  |  |  |  |  |
Annual Expected Stock Price Volatility |  | 34.75% | 34.99% | 34.93% |  |
Risk-Free Interest Rate |  | 2.48% | 2.38% | 1.35% |  |
Long Term Cash Awards |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |
Vesting period (years) |  |  |  |  | 3 years |
Compensation expense |  |  |  | $ 1.2 | $ 2.8 | $ 3.9
Stock options |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |
Vesting period (years) | 3 years |  |  |  |  |
Assumptions in determining the fair value of awards granted |  |  |  |  |  |
Annual Expected Stock Price Volatility | 33.48% | 32.70% | 31.14% |  |  |
Annual Expected Dividend Yield | 0.00% | 0.00% | 0.00% |  |  |
Risk-Free Interest Rate | 1.41% | 2.53% | 2.75% |  |  |
Historical period upon which annual expected stock price volatility is based (years) | 6 years |  |  |  |  |
Stock options | Minimum |  |  |  |  |  |
Assumptions in determining the fair value of awards granted |  |  |  |  |  |
Daily treasury yield curve period upon which average risk-free interest rate is based (years) | 5 years |  |  |  |  |
Stock options | Maximum |  |  |  |  |  |
Assumptions in determining the fair value of awards granted |  |  |  |  |  |
Daily treasury yield curve period upon which average risk-free interest rate is based (years) | 7 years |  |  |  |  |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -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=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -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=120381028&loc=d3e5070-113901 + Details
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