Unaudited Condensed Consolidated Statement of Comprehensive Income (Parenthetical) (Parentheticals) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net change in unrealized holding gains (losses) on available-for-sale securities, tax provisions (benefits)	$ 1.8	$ (3.0)	$ 1.7	$ (11.2)
Net unrealized (losses) gains on cash flow hedges, tax provisions (benefit)	6.7	36.8	(221.3)	39.7
Amortization of actuarial loss and prior service cost for postretirement plans and workers' compensation obligations, tax provisions	$ 8.3	$ 8.1	$ 25.0	$ 24.2