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Condensed Parent Company Financial Statements (Condensed Statements of Cash Flow) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Net cash flows from operating activities | $ 731.0 | $ 841.1 | $ 702.7
Cash flows used for investing activities: |  |  |
Other | (35.4) | (20.3) | (9.7)
Net cash flows used for investing activities | (754.7) | (1,155.5) | (652.1)
Cash flows used for financing activities: |  |  |
Common stock dividends | (208.3) | (199.3) | (188.1)
Net change in commercial paper | 11.9 | 164.7 | 55.4
Other | (18.9) | (10.3) | (9.4)
Net cash flows from (used for) financing activities | 12.3 | 324.2 | (198.5)
Net increase (decrease) in cash and cash equivalents | (11.4) | 9.8 | (147.9)
Cash and cash equivalents at beginning of period | 21.2 | 11.4 | 159.3
Cash and cash equivalents at end of period | 9.8 | 21.2 | 11.4
Supplemental cash flows information: |  |  |
Interest, net of capitalized interest | 171.7 | 155.2 | 157.6
Income taxes, net of refunds | (9.6) | (20.3) | (10.8)
Parent Company [Member] |  |  |
Net cash flows from operating activities | 238.0 | 260.0 | 193.0
Cash flows used for investing activities: |  |  |
Capital contributions to consolidated subsidiaries | (120.0) | (230.0) | (144.0)
Captial repayments from consolidated subsidiaries | 95.0 | 0 | 101.0
Net change in notes receivable from affiliates | 5 | 134 | 0
Other | (2.0) | 1.0 | 0
Net cash flows used for investing activities | (22.0) | (95.0) | (43.0)
Cash flows used for financing activities: |  |  |
Common stock dividends | (208.0) | (199.0) | (188.0)
Net change in borrowings with affiliates | 0 | 0 | (155)
Net change in commercial paper | (9.0) | 35.0 | 70.0
Other | 1.0 | (1.0) | 0
Net cash flows from (used for) financing activities | (216.0) | (165.0) | (273.0)
Net increase (decrease) in cash and cash equivalents | 0 | 0 | (123.0)
Cash and cash equivalents at beginning of period | 0 | 0 | 123.0
Cash and cash equivalents at end of period | 0 | 0 | 0
Supplemental cash flows information: |  |  |
Interest, net of capitalized interest | 13.0 | 11.0 | 11.0
Income taxes, net of refunds | $ 7.0 | $ (29.0) | $ (6.0)

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585 + Details
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