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Statements of Consolidated Comprehensive Income (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Net Income $ 71.7 $ 69.4 $ 332.2 $ 262.8
Net unrealized (loss) gain on available-for-sale securities (2.9) [1] 0.3 [1] (3.3) [1] (2.5) [1]
Net unrealized gain on cash flow hedges 0.5 [2] 0.9 [2] 1.4 [2] 1.9 [2]
Unrecognized pension benefit and OPEB costs 2.7 [3] 0.7 [3] 5.4 [3] 1.3 [3]
Total other comprehensive income 0.3 1.9 3.5 0.7
Total Comprehensive Income $ 72.0 $ 71.3 $ 335.7 $ 263.5
[1] Net unrealized (loss) gain on available-for-sale securities, net of $1.7 million tax benefit and $0.2 million tax expense in the second quarter of 2013 and 2012, respectively, and $1.8 million tax benefit for the first six months of 2013 and 2012.
[2] Net unrealized gains on derivatives qualifying as cash flow hedges, net of $0.3 million and $0.6 million tax expense in the second quarter of 2013 and 2012, and $0.9 million and $1.2 million tax expense for the first six months of 2013 and 2012, respectively.
[3] Unrecognized pension benefit and OPEB costs, net of $1.8 million and $0.3 million tax expense in the second quarter of 2013 and 2012, respectively, and $3.5 million and $0.8 million tax expense for the first six months of 2013 and 2012, respectively.