Unaudited Condensed Consolidated Statement of Comprehensive Income (Parenthetical) (Parentheticals) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net change in unrealized holding gains (losses) on available-for-sale securities, tax benefit	$ 3.7	$ (1.5)	$ (0.1)	$ (8.2)
Net unrealized (losses) gains on cash flow hedges, tax (benefits) provision	(217.1)	(28.5)	(228.0)	2.9
Amortization of actuarial loss and prior service cost for postretirement plans and workers' compensation obligations, tax provision	$ 8.4	$ 8.0	$ 16.7	$ 16.1