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Long-Term Debt Interest Expense and Investment Income (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Interest Expense & Investment Income (Narrative) [Abstract] |  |  |
Interest Expense | $ 99.9 us-gaap_InterestExpense | $ 115.9 us-gaap_InterestExpense | $ 101.6 us-gaap_InterestExpense
Interest Costs Capitalized | 5.8 us-gaap_InterestCostsCapitalized | 6.6 us-gaap_InterestCostsCapitalized | 8.2 us-gaap_InterestCostsCapitalized
Long-term Debt, Weighted Average Interest Rate | 6.40%us-gaap_LongtermDebtWeightedAverageInterestRate | 6.30%us-gaap_LongtermDebtWeightedAverageInterestRate | 8.00%us-gaap_LongtermDebtWeightedAverageInterestRate
Investment Income, Interest | $ 2.1 us-gaap_InvestmentIncomeInterest | $ 0.6 us-gaap_InvestmentIncomeInterest | $ 0.6 us-gaap_InvestmentIncomeInterest

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- Definition Amount of interest capitalized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Allowance for Funds Used during Construction -URI http://asc.fasb.org/extlink&oid=6504829 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 + Details
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- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(b)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Weighted average interest rate of long-term debt outstanding. + References No definition available. + Details
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