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Derivative Instruments, Hedging Activities and Fair Value Measurements, Recurring Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Total gains (losses) included in: |  |  |  |  |
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities | $ (1.4) |  | $ 29.5 |  | $ 25.7
Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |
Interest rate derivatives | 32.6 |  | 45.2 |  |
Commodity derivatives | 41.3 |  | 61.6 |  |
Financial assets | 73.9 |  | 106.8 |  |
Financial liabilities [Abstract] |  |  |  |  |
Interest rate derivatives | 7.8 |  | 192.6 |  |
Commodity derivatives | 55.1 |  | 45.5 |  |
Financial liabilities | 62.9 |  | 238.1 |  |
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |
Interest rate derivatives | 0 |  | 0 |  |
Commodity derivatives | 17.2 |  | 11.4 |  |
Financial assets | 17.2 |  | 11.4 |  |
Financial liabilities [Abstract] |  |  |  |  |
Interest rate derivatives | 0 |  | 0 |  |
Commodity derivatives | 30.8 |  | 13.1 |  |
Financial liabilities | 30.8 |  | 13.1 |  |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |
Interest rate derivatives | 32.6 |  | 45.2 |  |
Commodity derivatives | 20.2 |  | 47.8 |  |
Financial assets | 52.8 |  | 93.0 |  |
Financial liabilities [Abstract] |  |  |  |  |
Interest rate derivatives | 7.8 |  | 192.6 |  |
Commodity derivatives | 23.6 |  | 28.5 |  |
Financial liabilities | 31.4 |  | 221.1 |  |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |
Interest rate derivatives | 0 |  | 0 |  |
Commodity derivatives | 3.9 |  | 2.4 |  |
Financial assets | 3.9 |  | 2.4 |  |
Financial liabilities [Abstract] |  |  |  |  |
Interest rate derivatives | 0 |  | 0 |  |
Commodity derivatives | 0.7 |  | 3.9 |  |
Financial liabilities | 0.7 |  | 3.9 |  |
Reconciliation of changes in the fair value of Level 3 financial assets and liabilities [Roll Forward] |  |  |  |  |
Financial asset (liability) balance, net, beginning of period | (1.5) |  | 0.4 |  |
Total gains (losses) included in: |  |  |  |  |
Net income | 2.8 | [1] | (2.9) | [1] |
Other comprehensive income (loss) | (0.9) |  | 10.1 |  |
Settlements | 1.6 |  | 0.8 |  |
Transfers out of Level 3 | 1.2 | [2] | (9.9) | [2] |
Financial asset (liability) balance, net, end of period | 3.2 |  | (1.5) |  |
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities | $ 4.4 |  | $ 1.9 |  |
[1] | There were $4.4 million and $1.9 million of unrealized gains included in these amounts for the years ended December 31, 2013 and 2012, respectively.
[2] | Transfers out of Level 3 into Level 2 were due to shorter remaining transaction maturities falling inside of the Level 2 range at December 31, 2013 and 2012, respectively.

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- Definition This element represents net assets and liabilities measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References No definition available. + Details
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- Definition This item represents the amount of the total realized and unrealized gains or losses for the period which are included in the statement of income (or changes in net assets); the fair value of which assets and liabilities was or is measured on a recurring basis using significant unobservable inputs (Level 3). + 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)(1) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income, arising from assets, liabilities and financial instruments classified in shareholders' equity measured at fair value on a recurring basis using unobservable inputs (level 3). + 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)(1a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 + Details
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- Definition Fair value of financial and nonfinancial obligations. + 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 (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Fair value as of the balance sheet date of price risk derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets on the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + 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 + Details
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