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Non-operating Income (Expense) Disclosure (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Nonoperating Income (Expense) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Interest Expense |  |  |  |  |  |  |  |  |  | $ 29.9 us-gaap_InterestExpenseBorrowings | $ 36.2 us-gaap_InterestExpenseBorrowings | $ 48.0 us-gaap_InterestExpenseBorrowings
Amortization of financing costs and discounts |  |  |  |  |  |  |  |  |  | 1.2 us-gaap_AmortizationOfFinancingCostsAndDiscounts | 1.4 us-gaap_AmortizationOfFinancingCostsAndDiscounts | 1.5 us-gaap_AmortizationOfFinancingCostsAndDiscounts
Capitalized interest |  |  |  |  |  |  |  |  |  | 1.3 us-gaap_InterestCostsIncurredCapitalized | 1.6 us-gaap_InterestCostsIncurredCapitalized | (0.2)us-gaap_InterestCostsIncurredCapitalized
Interest expense, net of capitalized interest | 6.4 us-gaap_InterestExpense | 8.3 us-gaap_InterestExpense | 7.4 us-gaap_InterestExpense | 7.7 us-gaap_InterestExpense | 8.0 us-gaap_InterestExpense | 7.6 us-gaap_InterestExpense | 9.8 us-gaap_InterestExpense |  | 10.6 us-gaap_InterestExpense | 29.8 us-gaap_InterestExpense | 36.0 us-gaap_InterestExpense | 49.3 us-gaap_InterestExpense
Investment Income |  |  |  |  |  |  |  |  |  | 5.5 us-gaap_InvestmentIncomeInterest | 9.4 us-gaap_InvestmentIncomeInterest | 13.0 us-gaap_InvestmentIncomeInterest
SERP market adjustments |  |  |  |  |  |  |  |  |  | 0 us-gaap_GainLossOnInvestments | 0.9 us-gaap_GainLossOnInvestments | 1.8 us-gaap_GainLossOnInvestments
Investment income | 1.1 us-gaap_InvestmentIncomeNet | 0.9 us-gaap_InvestmentIncomeNet | 1.7 us-gaap_InvestmentIncomeNet | 1.8 us-gaap_InvestmentIncomeNet | 2.0 us-gaap_InvestmentIncomeNet | 1.7 us-gaap_InvestmentIncomeNet | 3.1 us-gaap_InvestmentIncomeNet |  | 3.5 us-gaap_InvestmentIncomeNet | 5.5 us-gaap_InvestmentIncomeNet | 10.3 us-gaap_InvestmentIncomeNet | 14.8 us-gaap_InvestmentIncomeNet
Foreign currency losses |  |  |  |  |  |  |  |  |  | (3.1)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | (5.3)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | (2.7)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Gain on settlement of litigation related to ARS |  |  |  |  |  |  |  |  |  | 0 us-gaap_GainLossRelatedToLitigationSettlement | 0 us-gaap_GainLossRelatedToLitigationSettlement | 20.0 us-gaap_GainLossRelatedToLitigationSettlement
Gain on acquisition of joint venture |  |  |  |  |  |  |  |  |  | 0 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain | 35.9 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain | 0 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain
Gain on sale of joint venture |  |  |  |  |  |  |  |  |  | 0 us-gaap_GainLossOnSaleOfStockInSubsidiaryOrEquityMethodInvestee | 1.2 us-gaap_GainLossOnSaleOfStockInSubsidiaryOrEquityMethodInvestee | 0 us-gaap_GainLossOnSaleOfStockInSubsidiaryOrEquityMethodInvestee
Loss on early debt extinguishment |  |  |  |  |  |  |  | (52.2)us-gaap_GainsLossesOnExtinguishmentOfDebt |  | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt | (2.3)us-gaap_GainsLossesOnExtinguishmentOfDebt | (52.2)us-gaap_GainsLossesOnExtinguishmentOfDebt
Other non-operating income (expense) |  |  |  |  |  |  |  |  |  | 3.1 us-gaap_OtherNonoperatingExpense | (29.5)us-gaap_OtherNonoperatingExpense | 34.9 us-gaap_OtherNonoperatingExpense
Nonoperating Income (Expense) | $ (1.3)us-gaap_NonoperatingIncomeExpense | $ (1.3)us-gaap_NonoperatingIncomeExpense | $ 3.8 us-gaap_NonoperatingIncomeExpense | $ (4.3)us-gaap_NonoperatingIncomeExpense | $ (2.3)us-gaap_NonoperatingIncomeExpense | $ 0.2 us-gaap_NonoperatingIncomeExpense | $ 32.3 us-gaap_NonoperatingIncomeExpense |  | $ (0.7)us-gaap_NonoperatingIncomeExpense | $ (27.4)us-gaap_NonoperatingIncomeExpense | $ 3.8 us-gaap_NonoperatingIncomeExpense | $ (69.4)us-gaap_NonoperatingIncomeExpense

X
- Definition Amount of noncash expense included in interest expense to allocate debt discount and premium, and the costs to issue debt and obtain financing over the related debt instruments. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30690-110894 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30700-110894 + Details
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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 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(c),9(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c)-(e) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition Amount of gain (loss) on sale or disposal of equity in securities of subsidiaries or equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Subparagraph g -Article 9 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 210.9-04.13(g)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process. + 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 Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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- Definition Amount of interest capitalized, including amount of allowance for funds used during construction. + 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 980 -SubTopic 835 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501662&loc=d3e56162-110433 + 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 Aggregate amount of interest expense on all borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.7,8) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + 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 Amount after accretion (amortization) of discount (premium), and investment expense, of interest income and dividend income on nonoperating securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 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(a),(b)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). + References Reference 1: 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) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 + Details
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- Definition The aggregate amount of other expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating expense recognized during the period. Such amounts may include: (a) unusual costs, (b) loss on foreign exchange transactions, (c) losses on securities (net of profits), and (d) miscellaneous other expense items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -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 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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