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Recent Accounting Pronouncements (Schedule of New Accounting Pronouncements and Changes in Accounting Principles) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Operation and maintenance                 $ 2,352.9 $ 1,601.7 $ 1,445.8
Total Operating Expenses                 4,989.8 3,953.4 3,626.4
Operating Income $ (78.4) $ (315.9) $ 118.4 $ 400.6 $ 270.6 $ 111.2 $ 124.0 $ 415.4 124.7 921.2 866.1
Other Income (Deductions)                      
Other, net                 43.5 (13.5) (3.0)
Total Other Deductions                 (355.3) (478.2) (352.5)
Previously Reported [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Operation and maintenance                   1,612.3 1,453.7
Total Operating Expenses                   3,964.0 3,634.3
Operating Income                   910.6 858.2
Other Income (Deductions)                      
Other, net                   (2.8) 1.5
Total Other Deductions                   (467.5) (348.0)
Restatement Adjustment [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Operation and maintenance                   1,601.7 1,445.8
Total Operating Expenses                   3,953.4 3,626.4
Operating Income                   921.2 866.1
Other Income (Deductions)                      
Other, net                   (13.4) (6.4)
Total Other Deductions                   (478.1) (355.9)
Accounting Standards Update 2017-07 [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Operation and maintenance                   (10.6) [1] (7.9) [2]
Total Operating Expenses                   (10.6) [1] (7.9) [2]
Operating Income                   10.6 [1] 7.9 [2]
Other Income (Deductions)                      
Other, net                   (10.6) [1] (7.9) [2]
Total Other Deductions                   (10.6) [1] (7.9) [2]
Gas Distribution Operations                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Operating Income                 (254.1) 550.1 569.7
Other Income (Deductions)                      
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results                   (4.4) 4.3
Electric Operations                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Operating Income                 386.1 367.4 301.3
Other Income (Deductions)                      
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results                   (2.6) (9.8)
Corporate and Other                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Operating Income                 $ (7.3) 3.7 (4.9)
Other Income (Deductions)                      
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results                   $ (3.6) $ (2.4)
[1] The effect of this change is attributable to our business segments: Gas Distribution Operations, Electric Operations, and Corporate and Other in the amounts of $(4.4) million, $(2.6) million, and $(3.6) million, respectively.
[2] The effect of this change is attributable to our business segments: Gas Distribution Operations, Electric Operations, and Corporate and Other in the amounts of $4.3 million, $(9.8) million, and $(2.4) million, respectively.