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Subsequent Event Subsequent Event Details (Details) (Subsequent Event [Member], USD $) | Feb. 09, 2015
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Subsequent Event [Member] |
Subsequent Event [Line Items] |
Modified Dutch Auction, Authorized Share Amount | 3,652,968 slgn_ModifiedDutchAuctionAuthorizedShareAmount / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Modified Dutch Auction, Authorized Amount | $ 200,000,000 slgn_ModifiedDutchAuctionAuthorizedAmount / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Modified Dutch Auction, Minimum Share Price | $ 54.75 slgn_ModifiedDutchAuctionMinimumSharePrice / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Modified Dutch Auction, Maximum Share Price | $ 58.50 slgn_ModifiedDutchAuctionMaximumSharePrice / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition Modified Dutch Auction, Authorized Amount + References No definition available. + Details
Name: | slgn_ModifiedDutchAuctionAuthorizedAmount
Namespace Prefix: | slgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Modified Dutch Auction, Authorized Share Amount + References No definition available. + Details
Name: | slgn_ModifiedDutchAuctionAuthorizedShareAmount
Namespace Prefix: | slgn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Modified Dutch Auction, Maximum Share Price + References No definition available. + Details
Name: | slgn_ModifiedDutchAuctionMaximumSharePrice
Namespace Prefix: | slgn_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Modified Dutch Auction, Minimum Share Price + References No definition available. + Details
Name: | slgn_ModifiedDutchAuctionMinimumSharePrice
Namespace Prefix: | slgn_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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