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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2017
Fair Value Disclosures [Abstract] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table Text Block] | The valuation of assets and liabilities measured at fair value in the Company’s Condensed Consolidated Balance Sheet at September 30, 2017 is summarized below.
|  | Fair Value Measurements |  |
(Dollars in Millions) |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Measured at Net Asset Value |  | Total Fair Value
Fixed Maturities: |  |  |  |  |  |  |  |  |  |
U.S. Government and Government Agencies and Authorities |  | $ | 117.1 |  |  | $ | 242.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 359.1 |
States and Political Subdivisions |  | — |  |  | 1,721.6 |  |  | 1.4 |  |  | — |  |  | 1,723.0 |
Foreign Governments |  | — |  |  | 3.3 |  |  | — |  |  | — |  |  | 3.3 |
Corporate Securities: |  |  |  |  |  |  |  |  |  |
Bonds and Notes |  | — |  |  | 2,645.7 |  |  | 387.4 |  |  | — |  |  | 3,033.1 |
Redeemable Preferred Stocks |  | — |  |  | — |  |  | 0.1 |  |  | — |  |  | 0.1 |
Collateralized Loan Obligations |  | — |  |  | 29.6 |  |  | 93.5 |  |  | — |  |  | 123.1 |
Other Mortgage- and Asset-backed |  | — |  |  | 1.1 |  |  | — |  |  | — |  |  | 1.1 |
Total Investments in Fixed Maturities |  | 117.1 |  |  | 4,643.3 |  |  | 482.4 |  |  | — |  |  | 5,242.8 |
Equity Securities: |  |  |  |  |  |  |  |  |  |
Preferred Stocks: |  |  |  |  |  |  |  |  |  |
Finance, Insurance and Real Estate |  | — |  |  | 58.6 |  |  | — |  |  | — |  |  | 58.6 |
Other Industries |  | — |  |  | 12.2 |  |  | 12.4 |  |  | — |  |  | 24.6 |
Common Stocks: |  |  |  |  |  |  |  |  |  |
Finance, Insurance and Real Estate |  | 7.2 |  |  | — |  |  | — |  |  | — |  |  | 7.2 |
Other Industries |  | 0.6 |  |  | 0.5 |  |  | 12.7 |  |  | — |  |  | 13.8 |
Other Equity Interests: |  |  |  |  |  |  |  |  |  |
Exchange Traded Funds |  | 205.0 |  |  | — |  |  | — |  |  | — |  |  | 205.0 |
Limited Liability Companies and Limited Partnerships |  | — |  |  | — |  |  | 34.1 |  |  | 168.8 |  |  | 202.9 |
Total Investments in Equity Securities |  | 212.8 |  |  | 71.3 |  |  | 59.2 |  |  | 168.8 |  |  | 512.1 |
Fair Value Option Investments: |  |  |  |  |  |  |  |  |  |
Limited Liability Companies and Limited Partnerships Hedge Funds |  | — |  |  | — |  |  | — |  |  | 77.1 |  |  | 77.1 |
Other Investments: |  |  |  |  |  |  |  |  |  |
Trading Securities |  | 6.3 |  |  | — |  |  | — |  |  | — |  |  | 6.3 |
Other Liabilities: |  |  |  |  |  |  |  |  |  |
Derivative Instrument Classified as Cash Flow Hedge |  | — |  |  | (0.7 | ) |  | — |  |  | — |  |  | (0.7 | )
Total |  | $ | 336.2 |  |  | $ | 4,713.9 |  |  | $ | 541.6 |  |  | $ | 245.9 |  |  | $ | 5,837.6 |
At September 30, 2017, the Company had unfunded commitments to invest an additional $133.0 million in certain limited liability investment companies and limited partnerships that will be included in Other Equity Interests if funded. Note 11 - Fair Value Measurements (continued) The valuation of assets measured at fair value in the Company’s Condensed Consolidated Balance Sheet at December 31, 2016 is summarized below.
|  | Fair Value Measurements |  |
(Dollars in Millions) |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Measured at Net Asset Value |  | Total Fair Value
Fixed Maturities: |  |  |  |  |  |  |  |  |  |
U.S. Government and Government Agencies and Authorities |  | $ | 119.5 |  |  | $ | 216.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 336.3 |
States and Political Subdivisions |  | — |  |  | 1,711.1 |  |  | 3.8 |  |  | — |  |  | 1,714.9 |
Foreign Governments |  | — |  |  | 3.4 |  |  | — |  |  | — |  |  | 3.4 |
Corporate Securities: |  |  |  |  |  |  |  |  |  |
Bonds and Notes |  | — |  |  | 2,541.6 |  |  | 403.2 |  |  | — |  |  | 2,944.8 |
Redeemable Preferred Stocks |  | — |  |  | — |  |  | 0.6 |  |  | — |  |  | 0.6 |
Collateralized Loan Obligations |  | — |  |  | 19.3 |  |  | 103.5 |  |  | — |  |  | 122.8 |
Other Mortgage- and Asset-backed |  | — |  |  | 2.1 |  |  | — |  |  | — |  |  | 2.1 |
Total Investments in Fixed Maturities |  | 119.5 |  |  | 4,494.3 |  |  | 511.1 |  |  | — |  |  | 5,124.9 |
Equity Securities: |  |  |  |  |  |  |  |  |  |
Preferred Stocks: |  |  |  |  |  |  |  |  |  |
Finance, Insurance and Real Estate |  | — |  |  | 59.6 |  |  | — |  |  | — |  |  | 59.6 |
Other Industries |  | — |  |  | 11.4 |  |  | 11.5 |  |  | — |  |  | 22.9 |
Common Stocks: |  |  |  |  |  |  |  |  |  |
Finance, Insurance and Real Estate |  | 26.4 |  |  | — |  |  | 7.1 |  |  | — |  |  | 33.5 |
Other Industries |  | 0.4 |  |  | 0.2 |  |  | 11.1 |  |  | — |  |  | 11.7 |
Other Equity Interests: |  |  |  |  |  |  |  |  |  |
Exchange Traded Funds |  | 144.4 |  |  | — |  |  | — |  |  | — |  |  | 144.4 |
Limited Liability Companies and Limited Partnerships |  | — |  |  | — |  |  | 40.9 |  |  | 168.7 |  |  | 209.6 |
Total Investments in Equity Securities |  | 171.2 |  |  | 71.2 |  |  | 70.6 |  |  | 168.7 |  |  | 481.7 |
Fair Value Option Investments: |  |  |  |  |  |  |  |  |  |
Limited Liability Companies and Limited Partnership Hedge Funds |  | — |  |  | — |  |  | — |  |  | 111.4 |  |  | 111.4 |
Other Investments: |  |  |  |  |  |  |  |  |  |
Trading Securities |  | 5.3 |  |  | — |  |  | — |  |  | — |  |  | 5.3 |
Other Assets: |  |  |  |  |  |  |  |  |  |
Derivative Instrument Classified as Cash Flow Hedge |  | — |  |  | 1.6 |  |  | — |  |  | — |  |  | 1.6 |
Total |  | $ | 296.0 |  |  | $ | 4,567.1 |  |  | $ | 581.7 |  |  | $ | 280.1 |  |  | $ | 5,724.9 |
Fair Value Inputs, Assets, Quantitative Information [Table Text Block] | The table below presents quantitative information about the significant unobservable inputs utilized by the Company in determining fair values for fixed maturity investments in corporate securities classified as Level 3 at September 30, 2017.
(Dollars in Millions) |  | Unobservable Input |  | Total Fair Value |  | Range of Unobservable Inputs |  | Weighted-average Yield
Investment-grade |  | Market Yield |  | $ | 93.0 |  |  | 2.4 | % | - | 6.4 | % |  | 3.6 | %
Non-investment-grade: |  |  |  |  |  |  |  |  |  |
Senior Debt |  | Market Yield |  | 161.1 |  |  | 4.1 |  | - | 14.9 |  |  | 9.9 |
Junior Debt |  | Market Yield |  | 119.2 |  |  | 6.6 |  | - | 27.2 |  |  | 13.1 |
Collateralized Loan Obligations |  | Market Yield |  | 93.5 |  |  | 4.0 |  | - | 9.3 |  |  | 7.0 |
Other |  | Various |  | 15.6 |  |  |  |  |  |  |
Total Level 3 Fixed Maturity Investments in Corporate Securities |  |  |  | $ | 482.4 |  |  |  |  |  |  |
Note 11 - Fair Value Measurements (continued) The table below presents quantitative information about the significant unobservable inputs utilized by the Company in determining fair values for fixed maturity investments in corporate securities classified as Level 3 at December 31, 2016.
(Dollars in Millions) |  | Unobservable Input |  | Total Fair Value |  | Range of Unobservable Inputs |  | Weighted-average Yield
Investment-grade |  | Market Yield |  | $ | 106.1 |  |  | 2.7 | % | - | 5.1 | % |  | 3.8 | %
Non-investment-grade: |  |  |  |  |  |  |  |  |  |
Senior Debt |  | Market Yield |  | 142.2 |  |  | 4.8 |  | - | 14.0 |  |  | 9.6 |
Junior Debt |  | Market Yield |  | 143.3 |  |  | 9.5 |  | - | 20.0 |  |  | 13.0 |
Collateralized Loan Obligations |  | Market Yield |  | 103.5 |  |  | 3.7 |  | - | 9.9 |  |  | 6.3 |
Other Debt |  | Various |  | 16.0 |  |  |  |  |  |  |
Total Level 3 Fixed Maturity Investments in Corporate Securities |  |  |  | $ | 511.1 |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] | Information by security type pertaining to the changes in the fair value of the Company’s investments classified as Level 3 for the nine months ended September 30, 2017 is presented below.
|  | Fixed Maturities |  | Equity Securities |  |
(Dollars in Millions) |  | Corporate Bonds and Notes |  | States and Political Sub-divisions |  | Redeemable Preferred Stocks |  | Collateralized Loan Obligations |  | Preferred and Common Stocks |  | Other Equity Interests |  | Total
Balance at Beginning of Period |  | $ | 403.2 |  |  | $ | 3.8 |  |  | $ | 0.6 |  |  | $ | 103.5 |  |  | $ | 29.7 |  |  | $ | 40.9 |  |  | $ | 581.7 |
Total Gains (Losses): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in Condensed Consolidated Statement of Operations |  | (4.7 | ) |  | (1.2 | ) |  | 0.1 |  |  | 1.4 |  |  | 1.7 |  |  | 3.7 |  |  | 1.0 |
Included in Other Comprehensive Income (Loss) |  | 4.6 |  |  | — |  |  | (0.1 | ) |  | 1.7 |  |  | 0.9 |  |  | (6.3 | ) |  | 0.8 |
Purchases |  | 120.4 |  |  | — |  |  | — |  |  | 22.7 |  |  | 3.2 |  |  | 2.9 |  |  | 149.2 |
Settlements |  | (75.5 | ) |  | (2.6 | ) |  | (0.5 | ) |  | (18.0 | ) |  | — |  |  | — |  |  | (96.6 | )
Sales |  | (32.0 | ) |  | — |  |  | — |  |  | (11.0 | ) |  | (6.9 | ) |  | (7.1 | ) |  | (57.0 | )
Transfers into Level 3 |  | — |  |  | 1.4 |  |  | — |  |  | 5.0 |  |  | — |  |  | — |  |  | 6.4 |
Transfers out of Level 3 |  | (28.6 | ) |  | — |  |  | — |  |  | (11.8 | ) |  | (3.5 | ) |  | — |  |  | (43.9 | )
Balance at End of Period |  | $ | 387.4 |  |  | $ | 1.4 |  |  | $ | 0.1 |  |  | $ | 93.5 |  |  | $ | 25.1 |  |  | $ | 34.1 |  |  | $ | 541.6 |
Note 11 - Fair Value Measurements (continued) Information by security type pertaining to the changes in the fair value of the Company’s investments classified as Level 3 for the three months ended September 30, 2017 is presented below.
|  | Fixed Maturities |  | Equity Securities |  |
(Dollars in Millions) |  | Corporate Bonds and Notes |  | States and Political Sub- divisions |  | Redeemable Preferred Stocks |  | Collateralized Loan Obligations |  | Preferred and Common Stocks |  | Other Equity Interests |  | Total
Balance at Beginning of Period |  | $ | 396.1 |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | 95.4 |  |  | $ | 22.8 |  |  | $ | 32.2 |  |  | $ | 546.6 |
Total Gains (Losses): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in Condensed Consolidated Statement of Operations |  | (0.8 | ) |  | — |  |  | — |  |  | 0.5 |  |  | 0.4 |  |  | 0.3 |  |  | 0.4 |
Included in Other Comprehensive Income (Loss) |  | 1.8 |  |  | — |  |  | — |  |  | — |  |  | 2.4 |  |  | 0.4 |  |  | 4.6 |
Purchases |  | 40.4 |  |  | — |  |  | — |  |  | 6.3 |  |  | — |  |  | 1.5 |  |  | 48.2 |
Settlements |  | (31.2 | ) |  | — |  |  | — |  |  | (5.5 | ) |  | — |  |  | — |  |  | (36.7 | )
Sales |  | (3.7 | ) |  | — |  |  | — |  |  | (4.3 | ) |  | (0.5 | ) |  | (0.3 | ) |  | (8.8 | )
Transfers into Level 3 |  | — |  |  | 1.4 |  |  | — |  |  | 5.0 |  |  | — |  |  | — |  |  | 6.4 |
Transfers out of Level 3 |  | (15.2 | ) |  | — |  |  | — |  |  | (3.9 | ) |  | — |  |  | — |  |  | (19.1 | )
Balance at End of Period |  | $ | 387.4 |  |  | $ | 1.4 |  |  | $ | 0.1 |  |  | $ | 93.5 |  |  | $ | 25.1 |  |  | $ | 34.1 |  |  | $ | 541.6 |
The Company’s policy is to recognize transfers between levels as of the end of the reporting period. There were no transfers between levels 1 and 2 for the nine and three months ended September 30, 2017. Transfers out of Level 3 were $43.9 million for the nine months ended September 30, 2017, of which $3.5 million was transferred into Level 1 due to an issuer’s initial public offering of the security and $40.4 million was transferred into Level 2 due to changes in the availability of market observable inputs. Transfers out of Level 3 for the three months ended September 30, 2017 were due to changes in the availability of market observable inputs. Note 11 - Fair Value Measurements (continued) Information by security type pertaining to the changes in the fair value of the Company’s investments classified as Level 3 for the nine months ended September 30, 2016 is presented below.
|  | Fixed Maturities |  | Equity Securities |  |
(Dollars in Millions) |  | Corporate Bonds and Notes |  | States and Political Sub- divisions |  | Redeemable Preferred Stocks |  | Collateralized Loan Obligations |  | Other Mortgage- and Asset- backed |  | Preferred and Common Stocks |  | Other Equity Interests |  | Total
Balance at Beginning of Period |  | $ | 436.3 |  |  | $ | — |  |  | $ | 3.8 |  |  | $ | 87.3 |  |  | $ | 3.8 |  |  | $ | 30.0 |  |  | $ | 45.6 |  |  | $ | 606.8 |
Total Gains (Losses): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in Condensed Consolidated Statement of Operations |  | (15.8 | ) |  | — |  |  | — |  |  | (0.2 | ) |  | 0.4 |  |  | 0.5 |  |  | (0.7 | ) |  | (15.8 | )
Included in Other Comprehensive Income (Loss) |  | 2.4 |  |  | — |  |  | — |  |  | 3.0 |  |  | (0.4 | ) |  | 3.5 |  |  | (3.4 | ) |  | 5.1 |
Purchases |  | 148.3 |  |  | — |  |  | — |  |  | 33.2 |  |  | — |  |  | 0.2 |  |  | 2.1 |  |  | 183.8 |
Settlements |  | (34.9 | ) |  | — |  |  | (2.9 | ) |  | — |  |  | (3.0 | ) |  | — |  |  | — |  |  | (40.8 | )
Sales |  | (79.3 | ) |  | — |  |  | — |  |  | (1.9 | ) |  | — |  |  | (3.2 | ) |  | (4.6 | ) |  | (89.0 | )
Transfers into Level 3 |  | — |  |  | 4.1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 4.1 |
Transfers out of Level 3 |  | (15.0 | ) |  | — |  |  | — |  |  | (10.1 | ) |  | (0.8 | ) |  | — |  |  | — |  |  | (25.9 | )
Balance at End of Period |  | $ | 442.0 |  |  | $ | 4.1 |  |  | $ | 0.9 |  |  | $ | 111.3 |  |  | $ | — |  |  | $ | 31.0 |  |  | $ | 39.0 |  |  | $ | 628.3 |
Information by security type pertaining to the changes in the fair value of the Company’s investments classified as Level 3 for the three months ended September 30, 2016 is presented below.
|  | Fixed Maturities |  | Equity Securities |  |
(Dollars in Millions) |  | Corporate Bonds and Notes |  | States and Political Sub- divisions |  | Redeemable Preferred Stocks |  | Collateralized Loan Obligations |  | Other Mortgage- and Asset- backed |  | Preferred and Common Stocks |  | Other Equity Interests |  | Total
Balance at Beginning of Period |  | $ | 459.4 |  |  | $ | — |  |  | $ | 2.9 |  |  | $ | 102.2 |  |  | $ | 3.7 |  |  | $ | 31.4 |  |  | $ | 47.2 |  |  | $ | 646.8 |
Total Gains (Losses): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in Condensed Consolidated Statement of Operations |  | (7.0 | ) |  | — |  |  | — |  |  | 0.1 |  |  | 0.4 |  |  | 1.4 |  |  | — |  |  | (5.1 | )
Included in Other Comprehensive Income (Loss) |  | (0.9 | ) |  | — |  |  | 0.4 |  |  | 5.2 |  |  | (0.4 | ) |  | 1.0 |  |  | (6.2 | ) |  | (0.9 | )
Purchases |  | 60.1 |  |  | — |  |  | — |  |  | 13.9 |  |  | — |  |  | 0.1 |  |  | 0.1 |  |  | 74.2 |
Settlements |  | (20.6 | ) |  | — |  |  | (2.4 | ) |  | — |  |  | (2.9 | ) |  | — |  |  | — |  |  | (25.9 | )
Sales |  | (34.0 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (2.9 | ) |  | (2.1 | ) |  | (39.0 | )
Transfers into Level 3 |  | — |  |  | 4.1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 4.1 |
Transfers out of Level 3 |  | (15.0 | ) |  | — |  |  | — |  |  | (10.1 | ) |  | (0.8 | ) |  | — |  |  | — |  |  | (25.9 | )
Balance at End of Period |  | $ | 442.0 |  |  | $ | 4.1 |  |  | $ | 0.9 |  |  | $ | 111.3 |  |  | $ | — |  |  | $ | 31.0 |  |  | $ | 39.0 |  |  | $ | 628.3 |
The Company’s policy is to recognize transfers between levels as of the end of the reporting period. There were no transfers between levels 1 and 2 or Levels 1 and 3 for the nine and three months ended September 30, 2016. Transfers into or out of Level 3 for the nine and three months ended September 30, 2016 were due to changes in the availability of market observable inputs. Note 11 - Fair Value Measurements (continued) The fair value of Debt is estimated using quoted prices for similar liabilities in markets that are not active. The inputs used in the valuation are considered Level 2 measurements. The fair value of Short-term Investments is estimated using inputs that are considered either Level 1 or Level 2 measurements.

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=66048111&loc=SL7498348-110258 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of quantitative information about the inputs used in the fair value measurement of assets. This disclosure may include, but is not limited to, the fair value of the asset, valuation technique used to measure fair value, the inputs used to measure fair value, the ranges of the inputs, and the weighted averages of the inputs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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