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Derivative Financial Instruments and Related Hedging Programs, Offsetting of Derivative Instruments by Counterparty (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Derivative Assets and Collateral Held by Counterparty |  |  |  |
Gross Amounts of Recognized Assets | $ 88.3 |  | $ 81.8 |
Gross Amounts Offset in the Consolidated Balance Sheets | 0 |  | 0 |
Net Amounts of Assets Presented in the Consolidated Balance Sheets | 88.3 |  | 81.8 |
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments | 1.8 |  | 1.2 |
Gross Amounts Not Offset in the Consolidated Balance Sheets - Cash Collateral Received | 0 |  | 0 |
Net Amount | 86.5 |  | 80.6 |
Derivative Liabilities and Collateral Held by Counterparty |  |  |  |
Gross Amounts of Recognized Liabilities | (89.7) |  | (86.1) |
Gross Amounts Offset in the Consolidated Balance Sheets | 0 |  | 0 |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets | (89.7) |  | (86.1) |
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments | (1.8) |  | (1.2) |
Gross Amounts Not Offset in the Consolidated Balance Sheets - Cash Collateral Pledged | 0 |  | 0 |
Net Amount | (87.9) |  | (84.9) |
Counterparty (with Netting Agreements) |  |  |  |
Derivative Assets and Collateral Held by Counterparty |  |  |  |
Gross Amounts of Recognized Assets | 1.4 |  | 1.0 |
Gross Amounts Offset in the Consolidated Balance Sheets | 0 |  | 0 |
Net Amounts of Assets Presented in the Consolidated Balance Sheets | 1.4 |  | 1.0 |
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments | 1.2 |  | 0.8 |
Gross Amounts Not Offset in the Consolidated Balance Sheets - Cash Collateral Received | 0 |  | 0 |
Net Amount | 0.2 |  | 0.2 |
Derivative Liabilities and Collateral Held by Counterparty |  |  |  |
Gross Amounts of Recognized Liabilities | (1.9) |  | (1.6) |
Gross Amounts Offset in the Consolidated Balance Sheets | 0 |  | 0 |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets | (1.9) |  | (1.6) |
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments | (1.2) |  | (0.8) |
Gross Amounts Not Offset in the Consolidated Balance Sheets - Cash Collateral Pledged | 0 |  | 0 |
Net Amount | (0.7) |  | (0.8) |
Counterparty (without Netting Agreements) |  |  |  |
Derivative Assets and Collateral Held by Counterparty |  |  |  |
Gross Amounts of Recognized Assets | 85.7 | [1] | 80.4 | [1]
Gross Amounts Offset in the Consolidated Balance Sheets | 0 | [1] | 0 | [1]
Net Amounts of Assets Presented in the Consolidated Balance Sheets | 85.7 | [1] | 80.4 | [1]
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments | 0 | [1] | 0 | [1]
Gross Amounts Not Offset in the Consolidated Balance Sheets - Cash Collateral Received | 0 | [1] | 0 | [1]
Net Amount | 85.7 | [1] | 80.4 | [1]
Derivative Liabilities and Collateral Held by Counterparty |  |  |  |
Gross Amounts of Recognized Liabilities | (86.9) | [1] | (83.2) | [1]
Gross Amounts Offset in the Consolidated Balance Sheets | 0 | [1] | 0 | [1]
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets | (86.9) | [1] | (83.2) | [1]
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments | 0 | [1] | 0 | [1]
Gross Amounts Not Offset in the Consolidated Balance Sheets - Cash Collateral Pledged | 0 | [1] | 0 | [1]
Net Amount | (86.9) | [1] | (83.2) | [1]
Counterparty (with partial Netting Agreements) |  |  |  |
Derivative Assets and Collateral Held by Counterparty |  |  |  |
Gross Amounts of Recognized Assets | 1.2 |  | 0.4 |
Gross Amounts Offset in the Consolidated Balance Sheets | 0 |  | 0 |
Net Amounts of Assets Presented in the Consolidated Balance Sheets | 1.2 |  | 0.4 |
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments | 0.6 |  | 0.4 |
Gross Amounts Not Offset in the Consolidated Balance Sheets - Cash Collateral Received | 0 |  | 0 |
Net Amount | 0.6 |  | 0 |
Derivative Liabilities and Collateral Held by Counterparty |  |  |  |
Gross Amounts of Recognized Liabilities | (0.9) |  | (1.3) |
Gross Amounts Offset in the Consolidated Balance Sheets | 0 |  | 0 |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets | (0.9) |  | (1.3) |
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments | (0.6) |  | (0.4) |
Gross Amounts Not Offset in the Consolidated Balance Sheets - Cash Collateral Pledged | 0 |  | 0 |
Net Amount | $ (0.3) |  | $ (0.9) |
[1] | Such amounts include the fair value of the Bifurcated Conversion Feature and Call Options at March 31, 2014 (see Note 9).

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