Income Taxes (Schedule of Changes in Gross Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions |
12 Months Ended | |
---|---|---|
Oct. 31, 2018 |
Oct. 31, 2017 |
|
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] | ||
Begining of the period | $ 59.9 | $ 39.9 |
Increase from prior year's UTB's | 4.2 | 12.9 |
Increase from current year's UTB's | 9.4 | 9.9 |
UTB (decrease) from expiration of statute of limitations | (4.6) | (2.8) |
End of the period | $ 68.9 | $ 59.9 |