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v3.3.1.900

Debt (Textuals) (Details) € in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2015 EUR (€) | Dec. 31, 2015 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |
Losses on Extinguishment of Debt | $ 0 | $ 0 | $ 200,000 |  |
Debt issuance cost |  | 1,200,000 | 1,400,000 |  |
Long-term debt |  | 335,500,000 |  |  | $ 298,200,000
Long-term debt, excluding current portion |  | 308,300,000 |  |  | 228,900,000
Interest expense | $ 15,600,000 | 18,100,000 | $ 18,600,000 |  |
Aggregate annual maturities of long-term debt [Abstract] |  |  |  |  |
2016 |  |  |  |  | 69,300,000
2017 |  |  |  |  | 2,200,000
2018 |  |  |  |  | 32,600,000
2020 |  |  |  |  | 27,100,000
Thereafter |  |  |  |  | $ 168,000,000
Senior A Notes Due 2022 [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, maturity date | Jul. 05, 2022 |  |  |  |
Debt instrument, stated interest rate |  |  |  | 3.67% | 3.67%
Senior B Notes Due 2024 [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, maturity date | Jul. 05, 2024 |  |  |  |
Debt instrument, stated interest rate |  |  |  | 3.82% | 3.82%
Senior C Notes Due 2027 [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, maturity date | Jul. 05, 2027 |  |  |  |
Debt instrument, stated interest rate |  |  |  | 4.02% | 4.02%
Series B Floating Rate Notes Due 2015 [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Long-term debt |  | 25,000,000 |  |  |
Euro Note B Due 2016 [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Long-term debt |  | 74,300,000 |  |  |
Term of debt | 10 years |  |  |  |
Debt Instrument, face amount | € |  |  |  | € 61.1 |
Debt instrument, maturity date | Feb. 27, 2016 |  |  |  |
Debt instrument, stated interest rate |  |  |  | 4.38% | 4.38%
Revolving Credit Facility Due 2017 [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit, noncurrent |  | 29,700,000 |  |  | $ 0
Variable rate basis | LIBOR |  |  |  |
Term Loan Due 2018 [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt issuance cost | $ 100,000 | 200,000 |  |  |
Long-term debt |  | 39,000,000 |  |  | 37,000,000
Long-term Debt, Current Maturities |  |  |  |  | 2,400,000
Variable rate basis | LIBOR |  |  |  |
Basis spread on variable interest rate | 1.50% |  |  |  |
Long-term Debt, Gross |  |  |  |  | 37,100,000
Debt Instrument, face amount |  |  |  |  | $ 42,800,000
Debt Instrument, Term | 5 years |  |  |  |
Debt instrument, maturity date | Jan. 31, 2018 |  |  |  |
Debt instrument, stated interest rate |  |  |  | 1.74% | 1.74%
Revolving credit facility, due 2020 [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, current borrowing capacity |  |  |  |  | $ 300,000,000.0
Line of Credit Facility Additional Borrowing Capacity |  |  |  |  | 100,000,000
Credit facility is available for swing-line loans |  |  |  |  | 30,000,000.0
Credit available for the issuance of letters of credit |  |  |  |  | 30,000,000.0
Debt issuance cost | $ 1,600,000 |  |  |  |
Line of credit, noncurrent |  | 0 |  |  | 27,100,000
Line of Credit Facility, unused commitment level |  |  |  |  | $ 269,900,000
Debt instrument, stated interest rate |  |  |  | 1.71% | 1.71%
Senior Notes [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt issuance cost | $ 900,000 | 1,000,000 |  |  |
Debt Instrument, face amount |  |  |  |  | $ 168,000,000
Weighted average of the coupon interest rate |  |  |  | 3.87% | 3.87%
Annual effective interest rate |  |  |  | 4.16% | 4.16%
Senior Notes [Member] | Senior A Notes Due 2022 [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Long-term debt |  | 41,800,000 |  |  | $ 41,800,000
Debt Instrument, face amount |  |  |  |  | $ 42,000,000
Debt instrument, stated interest rate |  |  |  | 3.67% | 3.67%
Senior Notes [Member] | Senior B Notes Due 2024 [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Long-term debt |  | 52,700,000 |  |  | $ 52,700,000
Debt Instrument, face amount |  |  |  |  | $ 53,000,000
Debt instrument, stated interest rate |  |  |  | 3.82% | 3.82%
Senior Notes [Member] | Senior C Notes Due 2027 [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Long-term debt |  | $ 72,500,000 |  |  | $ 72,600,000
Debt Instrument, face amount |  |  |  |  | $ 73,000,000
Debt instrument, stated interest rate |  |  |  | 4.02% | 4.02%
Letter of Credit [Member] | Revolving credit facility, due 2020 [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Outstanding amount |  |  |  |  | $ 3,000,000

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: 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) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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- Definition The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1314-112600 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1336-112600 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Line-of-Credit Arrangement -URI http://asc.fasb.org/extlink&oid=6517033 + Details
Name: | us-gaap_LongTermLineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Weighted average interest rate of long-term debt outstanding. + References No definition available. + Details
Name: | us-gaap_LongtermDebtWeightedAverageInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition this refers to Credit available for the issuance of letters of credit + References No definition available. + Details
Name: | wst_CreditAvailableForIssuanceOfLettersOfCredit
Namespace Prefix: | wst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This refers to credit facility is available for swing-line loans + References No definition available. + Details
Name: | wst_CreditFacilityIsAvailableForSwingLineLoans
Namespace Prefix: | wst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Debt Instrument, Debt Term + References No definition available. + Details
Name: | wst_DebtInstrumentDebtTerm
Namespace Prefix: | wst_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Additional borrowing capacity under the credit facility. + References No definition available. + Details
Name: | wst_LineofCreditFacilityAdditionalBorrowingCapacity
Namespace Prefix: | wst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_DebtInstrumentAxis=wst_SeniorNotesDue2022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=wst_SeniorBNotesDue2024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=wst_SeniorCNotesDue2027Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=wst_SeriesBFloatingRateNotesDue2015Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=wst_EuroNoteBDue2016Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=wst_RevolvingCreditFacilityDue2017Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=wst_TermLoanDue2018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=wst_Revolvingcreditfacilitydue2020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |