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v3.20.4

Debt - Narrative (Details) | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2012 USD ($) tranche
Line of Credit Facility [Line Items] |  |  |  |
Long-term debt, gross | $ 255,700,000 | $ 258,000,000.0 |  |
Less: current portion of long-term debt | 2,300,000 | 2,300,000 |  |
Long-term debt, net | 252,900,000 | 255,000,000.0 |  |
Number Tranches | tranche |  |  |  | 3
Unamortized debt issuance costs remaining | 500,000 | 700,000 |  |
Interest expense | 9,600,000 | 9,400,000 | $ 9,300,000 |
Aggregate annual maturities of long-term debt [Abstract] |  |  |  |
2021 | 2,300,000 |  |  |
2022 | 44,200,000 |  |  |
2023 | 2,200,000 |  |  |
2024 | 134,000,000.0 |  |  |
2025 | 0.0 |  |  |
Thereafter | 73,000,000.0 |  |  |
Series A notes, due July 5, 2022 (3.67%) |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, maturity date |  |  |  | Jul. 05, 2022
Series B notes, due July 5, 2024 (3.82%) |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, maturity date |  |  |  | Jul. 05, 2024
Series C notes, due July 5, 2027 (4.02%) |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, maturity date |  |  |  | Jul. 05, 2027
Revolving credit facility, due 2024 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of credit facility, current borrowing capacity | 300,000,000.0 |  |  |
Credit available for the issuance of letters of credit | 30,000,000.0 |  |  |
Line of credit facility, additional borrowing capacity | 350,000,000.0 |  |  |
Debt issuance costs | 400,000 | 1,100,000 |  |
Line of credit, noncurrent | 0 |  |  |
Line of credit facility, unused commitment level | 297,500,000 |  |  |
Term Loan, due December 31, 2024 (1.13%) |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt issuance costs | 100,000 |  |  |
Debt instrument, face amount |  | 90,000,000.0 |  |
Long-term debt, gross | 87,700,000 | 90,000,000.0 |  |
Less: current portion of long-term debt | 2,300,000 |  |  |
Long-term debt, net | $ 85,400,000 |  |  |
Debt instrument, stated interest rate | 1.13% |  |  |
Senior Notes |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, face amount |  |  |  | $ 168,000,000.0
Weighted average of the coupon interest rate |  |  |  | 3.87%
Unamortized debt issuance costs remaining | $ 400,000 | $ 500,000 |  |
Senior Notes | Series A notes, due July 5, 2022 (3.67%) |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, face amount |  |  |  | $ 42,000,000.0
Debt instrument, stated interest rate |  |  |  | 3.67%
Senior Notes | Series B notes, due July 5, 2024 (3.82%) |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, face amount |  |  |  | $ 53,000,000.0
Debt instrument, stated interest rate |  |  |  | 3.82%
Senior Notes | Series C notes, due July 5, 2027 (4.02%) |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, face amount |  |  |  | $ 73,000,000.0
Debt instrument, stated interest rate |  |  |  | 4.02%
Domestic Line of Credit | Revolving credit facility, due 2024 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Credit facility is available for swing-line loans | 30,000,000.0 |  |  |
Foreign Line of Credit | Revolving credit facility, due 2024 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Credit facility is available for swing-line loans | $ 20,000,000.0 |  |  |
Fed Funds Effective Rate Overnight Index Swap Rate | Revolving credit facility, due 2024 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on variable interest rate | 50.00% |  |  |
London Interbank Offered Rate (LIBOR) | Revolving credit facility, due 2024 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on variable interest rate | 1.00% |  |  |
London Interbank Offered Rate (LIBOR) | Term Loan, due December 31, 2024 (1.13%) |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on variable interest rate |  | 87.50% |  |
Letter of Credit | Revolving credit facility, due 2024 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Outstanding amount | $ 2,500,000 |  |  |
Minimum | Revolving credit facility, due 2024 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Ratio of debt to EBITDA | 3.5 |  |  |
Minimum | Base Rate |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on variable interest rate | 0.00% |  |  |
Minimum | London Interbank Offered Rate (LIBOR) | Revolving credit facility, due 2024 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on variable interest rate | 0.875% |  |  |
Maximum | Revolving credit facility, due 2024 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Ratio of debt to EBITDA | 4.0 |  |  |
Maximum | Base Rate |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on variable interest rate | 0.375% |  |  |
Maximum | London Interbank Offered Rate (LIBOR) | Revolving credit facility, due 2024 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on variable interest rate | 1.375% |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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=120398452&loc=d3e534808-122878 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 + Details
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- Definition The amount of any adjustment recognized to the balance of unamortized issuance costs associated with a share-lending arrangement entered into by the entity, in contemplation of a convertible debt offering or other financing, due, for example, to default by the share borrower. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=7656903&loc=SL6757497-112611 + 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://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=120400017&loc=d3e572229-122910 + Details
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- Definition Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Balance Type: | debit
Period Type: | instant

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

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

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- Definition Debt Instrument, Number Of Tranches + References No definition available. + Details
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Namespace Prefix: | wst_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Line Of Credit Facility Additional Borrowing Capacity + References No definition available. + Details
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Namespace Prefix: | wst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Ratio of debt to EBITDA + References No definition available. + Details
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Namespace Prefix: | wst_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=wst_RevolvingCreditFacilityDue2024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=wst_TermLoanDue2024Member
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_DomesticLineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
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: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |