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Acquisitions - GCA Preliminary Purchase Price Allocation (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Apr. 30, 2018 | Oct. 31, 2017
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 1,867.5 | $ 1,864.2
GCA Holding Corp. |  |  |
Business Acquisition [Line Items] |  |  |
Cash and cash equivalents |  | 0.2 | 2.5
Adjustment, Cash and cash equivalents |  | (2.3) |
Trade accounts receivable | [1] | 118.1 | 118.1
Prepaid expenses and other current assets |  | 10.3 | 10.3
Property, plant and equipment |  | 41.5 | 41.4
Adjustment, Property, plant and equipment |  | 0.1 |
Goodwill | [2] | 933.4 | 933.9
Adjustment, Goodwill | [2] | (0.5) |
Other assets |  | 4.0 | 4.2
Adjustment, Other assets |  | (0.2) |
Trade accounts payable |  | (9.6) | (9.1)
Adjustment, Trade accounts payable |  | (0.4) |
Insurance reserves |  | (35.6) | (35.5)
Adjustment, Insurance reserves |  | (0.2) |
Income taxes payable |  | (8.3) | (16.5)
Adjustment, Income taxes payable |  | 8.2 |
Accrued liabilities |  | (33.5) | (36.5)
Adjustment, Accrued liabilities |  | 2.9 |
Deferred income tax liability, net |  | (92.6) | (92.6)
Adjustment, Deferred income tax liability, net |  |  |
Other liabilities |  | (8.1) | (8.1)
Net assets acquired |  | 1,258.8 | 1,261.3
Adjustment, Net assets acquired |  | (2.4) |
Acquired Receivables |  |  |
Trade accounts receivable, gross |  | 122.0 |
Estimated uncollectible trade accounts receivable |  | 3.9 |
GCA Holding Corp. | Customer relationships |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | [3] | 330.0 | 340.0
Adjustment, Intangible assets | [3] | $ (10.0) |
Acquired Intangible Assets |  |  |
Amortization period for acquired intangible assets |  | 15 years |
GCA Holding Corp. | Trade names |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | [3] | $ 9.0 | $ 9.0
Acquired Intangible Assets |  |  |
Amortization period for acquired intangible assets |  | 2 years |
[1] | The gross amount of trade accounts receivable was $122.0 million, of which $3.9 million is expected to be uncollectible.
[2] | Goodwill is largely attributable to value we expect to obtain from long-term business growth, the established workforce, and buyer-specific synergies. This goodwill is not deductible for income tax purposes.
[3] | The amortization periods for the acquired intangible assets are 15 years for customer relationships and 2 years for trade names.

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