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Debt (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Long-term debt $ 330.7us-gaap_LongTermDebt $ 336.7us-gaap_LongTermDebt
Less: current portion of long-term debt 98.8us-gaap_DebtCurrent 27.2us-gaap_DebtCurrent
Long-term debt, excluding current portion 231.9us-gaap_LongTermDebtNoncurrent 309.5us-gaap_LongTermDebtNoncurrent
Series B Floating Rate Notes Due 2015 [Member]    
Debt Instrument [Line Items]    
Long-term debt 25.0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wst_SeriesBFloatingRateNotesDue2015Member
25.0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wst_SeriesBFloatingRateNotesDue2015Member
Euro Note B Due 2016 [Member]    
Debt Instrument [Line Items]    
Long-term debt 66.3us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wst_EuroNoteBDue2016Member
74.3us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wst_EuroNoteBDue2016Member
Capital leases, due 2016 [Member]    
Debt Instrument [Line Items]    
Capital leases 0.1us-gaap_CapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
0.2us-gaap_CapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
Revolving credit facility, due 2017 [Member]    
Debt Instrument [Line Items]    
Long-term debt 32.3us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wst_RevolvingCreditFacilityDue2017Member
29.7us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wst_RevolvingCreditFacilityDue2017Member
Line of credit facility outstanding borrowings, Yen 4.2wst_LineOfCreditFacilityOutstandingBorrowingsYen
/ us-gaap_LongtermDebtTypeAxis
= wst_RevolvingCreditFacilityDue2017Member
 
Line of credit facility outstanding borrowings, Euro 22.8wst_LineOfCreditFacilityOutstandingBorrowingsEuro
/ us-gaap_LongtermDebtTypeAxis
= wst_RevolvingCreditFacilityDue2017Member
 
Line of credit, current 5.3us-gaap_LinesOfCreditCurrent
/ us-gaap_LongtermDebtTypeAxis
= wst_RevolvingCreditFacilityDue2017Member
 
Term Loan Due 2018 [Member]    
Debt Instrument [Line Items]    
Long-term debt 38.7us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wst_TermLoanDue2018Member
39.2us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wst_TermLoanDue2018Member
Current portion of long-term debt 2.1us-gaap_LongTermDebtCurrent
/ us-gaap_LongtermDebtTypeAxis
= wst_TermLoanDue2018Member
 
Debt Instrument Term 5 years 0 months 0 days  
Notes Payable due 2020 [Member]    
Debt Instrument [Line Items]    
Long-term debt 0.3us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
0.3us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
Series A Notes, Due 2022 [Member]    
Debt Instrument [Line Items]    
Long-term debt 42.0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wst_SeniorNotesDue2022Member
42.0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wst_SeniorNotesDue2022Member
Series B Notes, Due 2024 [Member]    
Debt Instrument [Line Items]    
Long-term debt 53.0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wst_SeniorBNotesDue2024Member
53.0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wst_SeniorBNotesDue2024Member
Series C Notes, Due 2027 [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 73.0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wst_SeniorCNotesDue2027Member
$ 73.0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wst_SeniorCNotesDue2027Member