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Selected Quarterly Financial Data (Unaudited) - Financial Information (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Oct. 31, 2017
Jul. 31, 2017
Apr. 30, 2017
Jan. 31, 2017
Oct. 31, 2016
Jul. 31, 2016
Apr. 30, 2016
Jan. 31, 2016
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 1,497.9 $ 1,318.4 $ 1,310.5 $ 1,326.7 $ 1,322.3 $ 1,296.9 $ 1,257.1 $ 1,268.4 $ 5,453.6 [1] $ 5,144.7 [1] $ 4,897.8 [1]
Gross profit 160.9 134.0 145.9 131.6 149.0 135.6 129.5 127.1      
Income (loss) from continuing operations (2.5) 32.9 31.6 16.1 9.0 32.9 6.8 13.6 78.1 62.3 54.1
(Loss) income from discontinued operations, net of taxes (1.1) 0.0 (0.4) (72.9) (1.2) (1.8) (2.4) 0.4 (74.3) (5.1) 22.2
Net (loss) income $ (3.6) [2] $ 32.9 $ 31.3 $ (56.8) $ 7.8 $ 31.1 [3] $ 4.4 $ 14.0 $ 3.8 $ 57.2 $ 76.3
Net income per common share — Basic                      
Income (loss) from continuing operations (usd per share) $ (0.04) $ 0.59 $ 0.56 $ 0.29 $ 0.16 $ 0.58 $ 0.12 $ 0.24 $ 1.35 $ 1.11 $ 0.95
Income (loss) from discontinued operations (usd per share) (0.02) 0.00 (0.01) (1.30) (0.02) (0.03) (0.04) 0.01 (1.29) (0.09) 0.40
Net income (usd per share) (0.06) 0.59 0.56 (1.01) 0.14 0.55 0.08 0.25 0.07 1.02 1.35
Net income per common share — Diluted                      
Income (loss) from continuing operations (usd per share) (0.04) 0.58 0.56 0.28 0.16 0.58 0.12 0.24 1.34 1.09 0.94
Loss from discontinued operations (usd per share) (0.02) 0.00 (0.01) (1.28) (0.02) (0.03) (0.04) 0.00 (1.27) (0.09) 0.39
Net income (usd per share) $ (0.06) [2] $ 0.58 $ 0.55 $ (1.00) $ 0.14 $ 0.55 [3] $ 0.08 $ 0.24 $ 0.07 $ 1.01 $ 1.33
[1] Substantially all of our long-lived assets are related to United States operations.
[2] Includes transaction expenses of $22.0 million, or $0.38 per diluted share, related to the GCA acquisition
[3] Includes a tax benefit of $19.0 million, or $0.33 per diluted share, related to expiring statutes of limitations.