Income Taxes (Components of Tax Provision (Benefit)) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Taxes currently payable:
Federal									$ 489.4	$ 352.6	$ 101.5
State and local									56.3	45.4	(31.8)
Deferred income taxes									(273.8)	(245.1)	107.3
Total U.S. tax provision									271.9	152.9	177.0
International:
Taxes currently payable									54.1	64.1	55.4
Deferred income taxes									1.5	(1.5)	(7.1)
Total international tax provision									55.6	62.6	48.3
Total provision	96.9	69.0	109.0	52.6	2.8	69.5	79.7	63.5	327.5	215.5	225.3
Unremitted earnings of international subsidiaries											900.0
Deferred tax liability on foreign earnings	$ 316.5				$ 316.5				$ 316.5	$ 316.5