Restructuring Activities (Restructuring Activities) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
2012 Restructuring Activities [Member]
Restructuring Cost and Reserve [Line Items]
Liability for restructuring activities, ending balance	$ 21.4
2012 Restructuring Activities [Member] | Employee Termination Costs [Member]
Restructuring Cost and Reserve [Line Items]
Costs incurred		138.8
Payments	(70.9)	(21.2)
Liability released	(28.5)
Liability for restructuring activities, ending balance	18.2	117.6
2012 Restructuring Activities [Member] | Lease And Other Contract Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Costs incurred		11.9
Payments	(7.8)	(0.1)
Liability released	(0.8)
Liability for restructuring activities, ending balance	3.2	11.8
2012 Restructuring Activities [Member] | Commercial and Specialty Business [Member]
Restructuring Cost and Reserve [Line Items]
Liability for restructuring activities, ending balance	15.8
2012 Restructuring Activities [Member] | Commercial and Specialty Business [Member] | Employee Termination Costs [Member]
Restructuring Cost and Reserve [Line Items]
Costs incurred		70.8
Payments	(34.6)	(10.8)
Liability released	(12.0)
Liability for restructuring activities, ending balance	13.4	60.0
2012 Restructuring Activities [Member] | Commercial and Specialty Business [Member] | Lease And Other Contract Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Costs incurred		8.8
Payments	(5.7)	(0.1)
Liability released	(0.6)
Liability for restructuring activities, ending balance	2.4	8.7
2012 Restructuring Activities [Member] | Government Business [Member]
Restructuring Cost and Reserve [Line Items]
Liability for restructuring activities, ending balance	5.0
2012 Restructuring Activities [Member] | Government Business [Member] | Employee Termination Costs [Member]
Restructuring Cost and Reserve [Line Items]
Costs incurred		64.5
Payments	(34.6)	(9.8)
Liability released	(15.9)
Liability for restructuring activities, ending balance	4.2	54.7
2012 Restructuring Activities [Member] | Government Business [Member] | Lease And Other Contract Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Costs incurred		3.0
Payments	(2.0)	0
Liability released	(0.2)
Liability for restructuring activities, ending balance	0.8	3.0
2012 Restructuring Activities [Member] | Other [Member]
Restructuring Cost and Reserve [Line Items]
Liability for restructuring activities, ending balance	0.6
2012 Restructuring Activities [Member] | Other [Member] | Employee Termination Costs [Member]
Restructuring Cost and Reserve [Line Items]
Costs incurred		3.5
Payments	(1.7)	(0.6)
Liability released	(0.6)
Liability for restructuring activities, ending balance	0.6	2.9
2012 Restructuring Activities [Member] | Other [Member] | Lease And Other Contract Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Costs incurred		0.1
Payments	(0.1)	0
Liability released	0
Liability for restructuring activities, ending balance	0	0.1
2011 Restructuring Activities [Member]
Restructuring Cost and Reserve [Line Items]
Liability for restructuring activities, ending balance	17.5
2011 Restructuring Activities [Member] | Employee Termination Costs [Member]
Restructuring Cost and Reserve [Line Items]
Liability for restructuring activities, ending balance	1.9
2011 Restructuring Activities [Member] | Lease And Other Contract Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Liability for restructuring activities, ending balance	$ 15.6