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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)