XML 46 R62.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Financial Instruments Financial Instruments - Natural Gas Swap Agreements (Detail) (Commodity Contract [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 MMBTU | Dec. 31, 2013 MMBTU | Dec. 31, 2012
Derivative [Line Items] |  |  |
Percentage of hedged twelve month exposure to fluctuations in natural gas prices | 6.00%us-gaap_DerivativeNonmonetaryNotionalAmountPercentOfRequiredNeedCoverage | 27.00%us-gaap_DerivativeNonmonetaryNotionalAmountPercentOfRequiredNeedCoverage | 21.00%us-gaap_DerivativeNonmonetaryNotionalAmountPercentOfRequiredNeedCoverage
Net receipts (payments) under derivative swap agreements | $ 0.1 us-gaap_DerivativeCostOfHedgeNetOfCashReceived | $ (0.2)us-gaap_DerivativeCostOfHedgeNetOfCashReceived | $ (1.2)us-gaap_DerivativeCostOfHedgeNetOfCashReceived
Aggregate notional principal amount (MMBTU) of natural gas swap agreements | 1,000,000 invest_DerivativeNonmonetaryNotionalAmount | 100,000 invest_DerivativeNonmonetaryNotionalAmount |
Natural Gas Commodity [Member] | Minimum [Member] |  |  |
Derivative [Line Items] |  |  |
Underlying, Derivative | 4.01 us-gaap_UnderlyingDerivative / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_TradingActivityByTypeAxis = slgn_NaturalGasCommodityMember |  |
Natural Gas Commodity [Member] | Maximum [Member] |  |  |
Derivative [Line Items] |  |  |
Underlying, Derivative | 4.55 us-gaap_UnderlyingDerivative / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_TradingActivityByTypeAxis = slgn_NaturalGasCommodityMember |  |

X
- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNonmonetaryNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition The premium (cost) of a hedge, net of any cash received on settlement during the period. + References No definition available. + Details
Name: | us-gaap_DerivativeCostOfHedgeNetOfCashReceived
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of expected requirements covered by the aggregate notional amount of derivative contracts expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract as a percentage of expected need. + References No definition available. + Details
Name: | us-gaap_DerivativeNonmonetaryNotionalAmountPercentOfRequiredNeedCoverage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Specified interest rate, security price, commodity price, foreign exchange rate, index of prices or rates for a derivative contract but not the derivative contract itself. + References No definition available. + Details
Name: | us-gaap_UnderlyingDerivative
Namespace Prefix: | us-gaap_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_TradingActivityByTypeAxis=slgn_NaturalGasCommodityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |