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Debt (Term Loan) (Details) - USD ($) $ in Millions					6 Months Ended
	Apr. 30, 2019	Oct. 31, 2018	Apr. 30, 2018	Apr. 30, 2017	Jun. 30, 2016	Apr. 15, 2016	Jan. 26, 2016	Dec. 31, 2015
Term Loan					$ 750.0			$ 0.0
$1.5 Billion Term Loan Credit Agreement [Member]
Term Loan					750.0	$ 1,500.0	$ 1,500.0
Maturity date	Apr. 30, 2019	Oct. 31, 2018	Apr. 30, 2018	Apr. 30, 2017
Repayments of Debt					$ 750.0
Debt Instrument, Interest Rate, Stated Percentage					2.00%
Percentage of debt repayment in next twelve months			5.00%	5.00%
Percentage of debt repayment in third year	45.00%	45.00%

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- Definition

Percentage of debt repayment in next twelve months

+ References

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- Definition

Percentage of debt repayment in third year

+ References

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of loans from a bank with maturities initially due after one year or beyond the normal operating cycle if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16)(a))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
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- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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