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Statements of Consolidated Comprehensive Income (Parenthetical) - Parent Company - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax $ (0.1) $ 0.2 $ 1.2 $ 0.0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax (14.0) 0.2 (90.6) 1.1
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax $ (0.1) $ 0.1 $ (0.4) $ (2.1)