XML 112 R97.htm IDEA: XBRL DOCUMENT
v3.20.4

Other Expense (Income) - Schedule of Restructuring and Related Charges (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restructuring Reserve [Roll Forward] |  |  |
Restructuring beginning balance | $ 2.6 |  |
Non-cash asset write-downs | 0.0 | $ (2.3) | $ (2.2)
Restructuring , ending balance | 7.8 | 2.6 |
2020 Restructuring Plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring beginning balance | 0.0 |  |
Charges | 4.6 |  |
Cash payments | 0.0 |  |
Restructuring , ending balance | 4.6 | 0.0 |
2020 Restructuring Plan | Severance and benefits |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring beginning balance | 0.0 |  |
Charges | 4.6 |  |
Cash payments | 0.0 |  |
Restructuring , ending balance | 4.6 | 0.0 |
2020 Restructuring Plan | Asset-related charges |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring beginning balance | 0.0 |  |
Charges | 0.0 |  |
Cash payments | 0.0 |  |
Restructuring , ending balance | 0.0 | 0.0 |
2020 Restructuring Plan | Other charges |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring beginning balance | 0.0 |  |
Charges | 0.0 |  |
Cash payments | 0.0 |  |
Restructuring , ending balance | 0.0 | 0.0 |
2018 Restructuring Plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring beginning balance | 1.4 | 2.3 |
Charges |  | 4.9 | 0.3
Cash payments | (1.3) | (3.5) |
Non-cash asset write-downs |  | (2.3) |
Restructuring , ending balance | 0.1 | 1.4 | 2.3
2018 Restructuring Plan | Severance and benefits |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring beginning balance | 1.4 | 2.3 |
Charges |  | 2.6 |
Cash payments | (1.3) | (3.5) |
Non-cash asset write-downs |  | 0.0 |
Restructuring , ending balance | 0.1 | 1.4 | 2.3
2018 Restructuring Plan | Asset-related charges |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring beginning balance | 0.0 | 0.0 |
Charges |  | 0.3 |
Cash payments | 0.0 | 0.0 |
Non-cash asset write-downs |  | (0.3) |
Restructuring , ending balance | 0.0 | 0.0 | 0.0
2018 Restructuring Plan | Other charges |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring beginning balance | 0.0 | 0.0 |
Charges |  | 2.0 |
Cash payments | 0.0 | 0.0 |
Non-cash asset write-downs |  | (2.0) |
Restructuring , ending balance | $ 0.0 | $ 0.0 | $ 0.0

X
- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3367-108585 + Details
Name: | us-gaap_PaymentsForRestructuring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
Name: | us-gaap_RestructuringCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
Name: | us-gaap_RestructuringReserve
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_RestructuringReserveRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of decrease in the reserve for full or partial settlement through consideration other than cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
Name: | us-gaap_RestructuringReserveSettledWithoutCash2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_RestructuringPlanAxis=wst_The2020RestructuringPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=us-gaap_EmployeeSeveranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=wst_AssetRelatedChargesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=us-gaap_OtherRestructuringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringPlanAxis=wst_The2018RestructuringPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |