Hedging Instruments - Additional Information (Details) $ in Millions	3 Months Ended
Apr. 30, 2018 USD ($) oz
Derivative [Line Items]
Expected approximate amount of net pre-tax derivative losses included in accumulated other comprehensive income that will be reclassified into earnings within the next 12 months	$ 3.4
2012 4.40% Series B Notes, due July 2042 [Member]
Derivative [Line Items]
Debt Instrument, Face Amount	250.0
Interest Rate Swap [Member] \| 2012 Debt Issuance [Member]
Derivative [Line Items]
Unrealized loss on interest rate swaps	18.2
Interest Rate Swap [Member] \| 2014 Debt Issuance [Member]
Derivative [Line Items]
Unrealized loss on interest rate swaps	$ 3.6
Foreign Exchange Forward [Member] \| Maximum [Member]
Derivative [Line Items]
Derivative, Term of Contract	12 months
Precious Metal Forward Contracts [Member] \| Maximum [Member]
Derivative [Line Items]
Derivative, Term of Contract	14 months
Platinum [Member]
Derivative [Line Items]
Notional amount of precious metal hedge (in ounces) \| oz	36,000
Silver [Member]
Derivative [Line Items]
Notional amount of precious metal hedge (in ounces) \| oz	720,000
Gold [Member]
Derivative [Line Items]
Notional amount of precious metal hedge (in ounces) \| oz	28,800

Derivative Instrument Notional Non Monetary Ounces Outstanding

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- Definition

Amount that remains recorded as an unrealized loss in accumulated other comprehensive loss as of the end of the period. The loss was incurred on forward-starting interest rate swaps and is amortized over the term of the debt to which the swaps relate.

+ References

No definition available.

+ Details

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- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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