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Commitments, Contingent Liabilities and Other Matters (Details 2) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Contingencies and other matters |  |
Carrying values of accruals | $ 619.6 us-gaap_LossContingencyAccrualAtCarryingValue | $ 610.1 us-gaap_LossContingencyAccrualAtCarryingValue
Accruals included in other long-term liabilities | 571.5 us-gaap_LossContingencyAccrualCarryingValueNoncurrent | 561.8 us-gaap_LossContingencyAccrualCarryingValueNoncurrent
Risk management matters |  |
Contingencies and other matters |  |
Carrying values of accruals | 575.4 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = spw_RiskManagementMember | 565.0 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = spw_RiskManagementMember
Insurance recovery assets | $ 503.7 us-gaap_LossContingencyReceivableNoncurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = spw_RiskManagementMember | $ 496.7 us-gaap_LossContingencyReceivableNoncurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = spw_RiskManagementMember

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- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Definition Amount of loss contingency liability expected to be resolved after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Definition Amount of receivable related to a loss contingency accrual that is expected to be collected after one year or beyond the normal operating cycle, if longer. For example, an insurance recovery receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12053-110248 + Details
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