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Selected Quarterly Financial Data - Footnote Disclosure (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Oct. 31, 2016
Jul. 31, 2016
Oct. 31, 2015
Jul. 31, 2015
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2014
Segment Reporting Information [Line Items]              
Tax benefit related to lapse of statute of limitations   $ 19.0     $ 21.9 $ 5.2 $ 3.2
Tax benefit effect on diluted earnings per share (in usd per share)   $ 0.33          
Impairment loss         22.5 0.0 0.0
Impairment effect on diluted earnings per share (in usd per share) $ 0.40            
Increase in Total Reserve Claims         32.9 35.9  
Self-insurance reserve adjustments       $ 35.9 33.6 $ 37.4 $ (8.7)
Self-insurance reserve adjustment effect on diluted earnings per share (in usd per share)       $ 0.62      
Gain on sale after income taxes     $ 14.4        
Gain on sale effect on diluted earnings per share (in usd per share)     $ 0.25        
Building & Energy Solutions              
Segment Reporting Information [Line Items]              
Impairment loss         22.5    
Fair Value, Measurements, Nonrecurring | Building & Energy Solutions              
Segment Reporting Information [Line Items]              
Impairment loss         $ 22.5