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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, 2013 | Dec. 31, 2012
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Derivative Assets and Collateral Held by Counterparty |  |
Gross Amounts of Recognized Assets | $ 63.4 | $ 58.5
Gross Amounts Offset in the Consolidated Balance Sheets | 0 | 0
Net Amounts of Assets Presented in the Consolidated Balance Sheets | 63.4 | 58.5
Gross Amounts Not Offset in the Consolidated Balance Sheets |  |
Financial Instruments | 2.0 | 2.6
Cash Collateral Received | 0 | 0
Net Amount | 61.4 | 55.9
Derivative Liabilities and Collateral Held by Counterparty |  |
Gross Amounts of Recognized Liabilities | (72.0) | (66.7)
Gross Amounts Offset in the Consolidated Balance Sheets | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets | (72.0) | (66.7)
Gross Amounts Not Offset in the Consolidated Balance Sheets |  |
Financial Instruments | (2.0) | (2.6)
Cash Collateral Pledged | 0 | 0
Net Amount | (70.0) | (64.1)
Counterparty (with Netting Agreements) |  |
Derivative Assets and Collateral Held by Counterparty |  |
Gross Amounts of Recognized Assets | 1.1 | 1.7
Gross Amounts Offset in the Consolidated Balance Sheets | 0 | 0
Net Amounts of Assets Presented in the Consolidated Balance Sheets | 1.1 | 1.7
Gross Amounts Not Offset in the Consolidated Balance Sheets |  |
Financial Instruments | 1.1 | 1.7
Cash Collateral Received | 0 | 0
Net Amount | 0 | 0
Derivative Liabilities and Collateral Held by Counterparty |  |
Gross Amounts of Recognized Liabilities | (2.1) | (1.9)
Gross Amounts Offset in the Consolidated Balance Sheets | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets | (2.1) | (1.9)
Gross Amounts Not Offset in the Consolidated Balance Sheets |  |
Financial Instruments | (1.1) | (1.7)
Cash Collateral Pledged | 0 | 0
Net Amount | (1.0) | (0.2)
Counterparty (without Netting Agreements) |  |
Derivative Assets and Collateral Held by Counterparty |  |
Gross Amounts of Recognized Assets | 61.4 | 55.9
Gross Amounts Offset in the Consolidated Balance Sheets | 0 | 0
Net Amounts of Assets Presented in the Consolidated Balance Sheets | 61.4 | 55.9
Gross Amounts Not Offset in the Consolidated Balance Sheets |  |
Financial Instruments | 0 | 0
Cash Collateral Received | 0 | 0
Net Amount | 61.4 | 55.9
Derivative Liabilities and Collateral Held by Counterparty |  |
Gross Amounts of Recognized Liabilities | (68.6) | (63.8)
Gross Amounts Offset in the Consolidated Balance Sheets | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets | (68.6) | (63.8)
Gross Amounts Not Offset in the Consolidated Balance Sheets |  |
Financial Instruments | 0 | 0
Cash Collateral Pledged | 0 | 0
Net Amount | (68.6) | (63.8)
Counterparty (with partial Netting Agreements) |  |
Derivative Assets and Collateral Held by Counterparty |  |
Gross Amounts of Recognized Assets | 0.9 | 0.9
Gross Amounts Offset in the Consolidated Balance Sheets | 0 | 0
Net Amounts of Assets Presented in the Consolidated Balance Sheets | 0.9 | 0.9
Gross Amounts Not Offset in the Consolidated Balance Sheets |  |
Financial Instruments | 0.9 | 0.9
Cash Collateral Received | 0 | 0
Net Amount | 0 | 0
Derivative Liabilities and Collateral Held by Counterparty |  |
Gross Amounts of Recognized Liabilities | (1.3) | (1.0)
Gross Amounts Offset in the Consolidated Balance Sheets | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets | (1.3) | (1.0)
Gross Amounts Not Offset in the Consolidated Balance Sheets |  |
Financial Instruments | (0.9) | (0.9)
Cash Collateral Pledged | 0 | 0
Net Amount | $ (0.4) | $ (0.1)

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