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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Unrealized gain (loss) arising during the period, tax expense $ 0.5 $ 1.1
Reclassification adjustments for losses included in net income, tax expense 2.8 1.0
Amortization of net actuarial loss, tax expense $ 0.5 $ 0.3