Divestitures (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Sale of business segment					$ 449.0
Proceeds from disposition of business					462.6
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	1.1	(3.5)	(6.6)	98.5	99.8
Gain on sale of business segment, after tax					16.2
Cost Allocated for Discontinued Business Segment Included in Continued Operations				8.8
Transition Services Revenue	3.8	6.1	13.3	9.0
Federal, state and foreign income tax obligation	(4.6)	(1.1)	(8.6)	84.1	83.6
Maximum period of agreement for earning transition services revenues for services provided to the buyer (in months)	24
Elimination of goodwill and intangible assets from sale of business segment					201.7
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 5.7	$ (2.4)	$ 2.0	$ 70.6