Other income expense Other income expense (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Other Income and Expenses [Abstract]
Program termination agreement	$ 0	$ 0	$ 11.3	$ 0
Retirement related obligations	0	0	5.9	0
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	0	37.9	0	37.9
Other Income	(2.4)	(1.3)	(2.7)	(0.2)
Other income expense	$ (2.4)	$ 36.6	$ 14.5	$ 37.7