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Accumulated Other Comprehensive Income (Other Comprehensive Income (Loss) Reclassification Adjustments) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) Reclassification Adjustments (Parantheticals) [Abstract]      
Net holding gain (loss) on investment securities arising during the period, tax (expense) benefit $ (118.9) $ 180.4 $ (107.9)
Reclassification adjustment for net realized gain on investment securities, tax expense 36.6 25.9 44.8
Non-credit component of other-than-temporary impairments on investments, tax (expense) benefit (2.8) 3.0 2.1
Cash flow hedges, holding loss, tax benefit 47.0 24.4 1.9
Net change in unrecognized periodic benefit costs for defined benefit pension and postretirement benefit plans, tax benefit 5.7 13.4 75.2
Foreign currency translation adjustment, tax benefit (expense) (1.1) 1.8 2.2
Net gain (loss) realized in other comprehensive income, tax benefit (expense) $ (33.5) $ 248.9 $ 18.3