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CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Tax benefit of change in postretirement benefit plans $ 0 $ 340.9 $ 0 $ 317.2
Tax expense of net change in unrealized gains on investment securities 0 0.5 0 7.1
Tax benefit of amortization of prior service costs 0 0.2 0 0.7
Tax benefit of amortization of net actuarial loss 0 11.4 0 34.6
Tax benefit of prior service costs 0.8 0.8 0.8 0.8
Tax benefit of net actuarial loss 353.3 353.3 353.3 353.3
Tax benefit of unrealized losses arising during period 0 0.5 0 1.0
Tax expense of gains realized during the period $ 0 $ 0 $ 0 $ 6.1