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Shareholders' Equity and Long-Term Incentive Compensation - Long-Term Incentive Compensation (Details) $ in Millions				12 Months Ended
	Feb. 22, 2018	Mar. 01, 2017	Mar. 02, 2016	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
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)				1,683,000
Maximum | Directors' Plan
Stock-based Compensation
Shares available for grant (in 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 | $				$ 11.6	$ 12.0	$ 12.7
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 | $				$ 2.8	4.6	$ 4.8
Restricted stock shares and restricted stock units | 2002 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				1 year
PSU's
Stock-based Compensation
Vesting period				3 years		3 years
Assumptions in determining the fair value of awards granted
Annual expected stock price volatility	42.25%	41.03%	36.91%
Annual expected dividend yield	0.00%	0.00%	0.00%
Risk-free interest rate	2.38%	1.52%	0.97%
Correlation between total shareholder return for SPX and the applicable S&P index	0.3267	0.3685	0.3354
PSU's | 2002 Stock Compensation Plan
Stock-based Compensation
Reduction of shares available for grant (in 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	34.99%	34.49%	32.94%
Risk-free interest rate	2.38%	1.52%	0.97%
PSU's | Maximum
Stock-based Compensation
Maximum vesting attainment (percentage)				150.00%
Long Term Cash Awards
Stock-based Compensation
Vesting period				3 years
Compensation expense | $				$ 3.9	$ 3.8	$ 1.0

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The maximum period over which the fair value of restricted stock and restricted stock units are amortized.

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The historical period upon which annual expected stock price volatility is based.

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Represents the assumed correlation between the total shareholder return for the entities stock and the S&P 500 Composite Index and the S&P Composite 1500 Industrials Index.

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Represents the amount by which common stock available is reduced for each share granted.

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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.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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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.

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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.

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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.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Percentage of vesting of share-based compensation awards.

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