Investments In Equity Method Investees (Details) - USD ($) $ in Millions |
Apr. 30, 2017 |
Oct. 31, 2016 |
|---|---|---|
| Private Equity Partnership [Member] | ||
| Schedule Of Equity Method Investments [Line Items] | ||
| Equity method investment ownership percentage | 7.00% | 7.00% |
| Equity method investment aggregate cost | $ 3.0 | $ 2.6 |
| Hexavest [Member] | ||
| Schedule Of Equity Method Investments [Line Items] | ||
| Equity method investment ownership percentage | 49.00% | 49.00% |
| Equity method investment aggregate cost | $ 134.9 | $ 137.3 |
| Equity method investment underlying equity in net assets | 6.1 | 5.3 |
| Intangible assets net excluding goodwill, equity in investee | 23.2 | 24.5 |
| Goodwill, equity in investee | 111.8 | 114.1 |
| Deferred tax liability, equity in investee | $ 6.2 | $ 6.6 |
| Additional interest that may be purchased by the Company in future periods | 26.00% | 26.00% |
| Value of the Hexavest exercisable option | $ 8.3 | $ 8.3 |