Acquisitions - GCA Pro Forma Financial Information (Details) - GCA Holding Corp. - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Apr. 30, 2018 |
Apr. 30, 2017 |
Apr. 30, 2018 |
Apr. 30, 2017 |
|
| Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] | ||||
| Revenue related to GCA recorded in reporting period | $ 256.4 | $ 508.0 | ||
| Operating profit related to GCA recorded in reporting period | $ 7.5 | $ 12.5 | ||
| Pro forma statutory tax rate (percent) | 41.00% | |||
| Pro forma revenue | $ 1,560.5 | $ 3,139.4 | ||
| Pro forma income from continuing operations | $ 31.9 | $ 46.5 | ||