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v2.4.1.9

Performance Units - Fair Value Assumptions (Details) (Performance Units, USD $) | 3 Months Ended
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Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award |
Weighted-average risk-free interest rate | 0.60%sd_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageRiskFreeInterestRate
Weighted-average fair value per unit | $ 87.35 sd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageFairValue
Minimum |
Share-based Compensation Arrangement by Share-based Payment Award |
Expected price volatility range | 24.90%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum |
Share-based Compensation Arrangement by Share-based Payment Award |
Expected price volatility range | 71.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Definition The weighted average fair value of awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan). + References No definition available. + Details
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Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition The weighted average risk-free interest rate assumption used in valuing an option on its own shares. + References No definition available. + Details
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- Definition Weighted average expected volatility rate of share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Balance Type: | na
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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration