Other income expense Other income expense (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Other Income and Expenses [Abstract]
Program termination agreement	$ 11.3	$ 0
Retirement related obligations	5.9	0
Other expense		1.1
Other Income	(0.3)
Other income expense	$ (16.9)	$ (1.1)