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Shareholders' Equity and Stock-Based Compensation (Details 3) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Apr. 01, 2013
Jan. 02, 2013
Jan. 03, 2012
Dec. 31, 2013
Dec. 31, 2013
Minimum
Dec. 31, 2013
Maximum
Dec. 31, 2013
Restricted stock shares and restricted stock units
Dec. 31, 2012
Restricted stock shares and restricted stock units
Dec. 31, 2011
Restricted stock shares and restricted stock units
Dec. 31, 2013
Restricted stock shares and restricted stock units
Non-officer employees
Dec. 31, 2013
2013 target performance awards
Dec. 31, 2013
2013 target performance awards
Minimum
Dec. 31, 2013
2013 target performance awards
Maximum
Dec. 31, 2013
2013 target performance awards
Officers
Dec. 31, 2013
2013 target performance awards
Non-officer employees
Dec. 31, 2012
2013 target performance awards
Non-officer employees
Dec. 31, 2013
Stock Options granted to key employees
Dec. 31, 2012
Stock Options granted to key employees
Dec. 31, 2011
Stock Options granted to key employees
Jan. 03, 2012
S&P 500 Index
Dec. 31, 2013
S&P 500 Index
Dec. 31, 2013
Stock options
Dec. 31, 2012
Stock options
Dec. 31, 2011
Stock options
Apr. 01, 2013
S&P Composite 1500 Industrials Index
Jan. 02, 2013
S&P Composite 1500 Industrials Index
Dec. 31, 2013
2002 Stock Compensation Plan
Dec. 31, 2013
Directors' Plan
Dec. 31, 2013
Directors' Plan
Restricted stock shares and restricted stock units
Dec. 31, 2012
Directors' Plan
Restricted stock shares and restricted stock units
Dec. 31, 2011
Directors' Plan
Restricted stock shares and restricted stock units
Stock-based Compensation                                                              
Shares available for grant                                                     2,684,000        
Reduction of shares available for grant                                                     2        
Classification of excess tax benefits from stock-based compensation as financing cash flows                                 $ 6.3 $ 3.8 $ 6.6                        
Percentage of target award, which can be earned by each eligible employee                       25.00% 125.00%                                    
Portion of the grant that will vest if the company outperforms the S&P Index for the prior year                                         one-third                    
Vesting period       3 years 1 year 3 years       3 years 3 years     3 years 3 years 3 years                         1 year 3 years 3 years
Common stock shares available for grant                                                       18,000      
Maximum period over which the fair value of restricted stock shares and restricted stock units are amortized       3 years                                                      
Options outstanding (in shares)                                           0                  
Compensation expense             32.8 38.8 38.6                         0 0 0              
Related tax benefit             $ 12.1 $ 14.8 $ 14.5                                            
Assumptions in determining the fair value of awards granted                                                              
Annual expected stock price volatility (as a percent) 35.50% 36.30% 44.30%                                 23.10%         21.20% 22.40%          
Annual expected dividend yield (as a percent) 1.29% 1.42% 1.60%                                                        
Risk-free interest rate (as a percent) 0.33% 0.37% 0.44%                                 0.44%         0.33% 0.37%          
Correlation between total shareholder return for SPX and the applicable S&P Index 0.7668 0.7778 0.7365                                                        
Historical period upon which annual expected stock price volatility is based       3 years                                                      
Daily treasury yield curve period upon which average risk-free interest rate is based         1 year 3 years