XML 76 R62.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Financial Instruments Financial Instruments - Natural Gas Swap Agreements (Detail) MMBTU in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) MMBTU $ / MMBTU | Dec. 31, 2015 USD ($) MMBTU | Dec. 31, 2014 USD ($)
Natural Gas Commodity [Member] |  |  |
Derivative [Line Items] |  |  |
Percentage of hedged twelve month exposure to fluctuations in natural gas prices | 48.00% | 47.00% | 9.00%
Net (payments) receipts under derivative swap agreements | $ | $ (0.9) | $ (1.2) | $ 0.1
Aggregate Notional Principal Amount of Outstanding Gas Swap Agreements | MMBTU | 1.4 | 1.4 |
Minimum [Member] | Natural Gas [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Swap Type, Fixed Price | 2.86 |  |
Maximum [Member] | Natural Gas [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Swap Type, Fixed Price | 3.44 |  |

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
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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 Fixed price related to the price risk swap derivative. + References No definition available. + Details
Name: | us-gaap_DerivativeSwapTypeFixedPrice
Namespace Prefix: | us-gaap_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | instant

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

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_NaturalGasReservesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |