Activity Related to Restructuring Obligations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Restructuring Reserve [Roll Forward]
Balance, Beginning	$ 2.8	$ 6.8
Charges		2.1
Cash payments	(2.8)	(4.0)
Non-cash adjustments		(2.1)
Balance, Ending	0	2.8
Severance and benefits [Member]
Restructuring Reserve [Roll Forward]
Balance, Beginning	2.8	6.2
Charges		(1.2)
Cash payments	(2.8)	(2.6)
Non-cash adjustments		0.4
Balance, Ending	0	2.8
Other Costs [Member]
Restructuring Reserve [Roll Forward]
Balance, Beginning	0	0.6
Charges		3.3
Cash payments	0	(1.4)
Non-cash adjustments		(2.5)
Balance, Ending	$ 0	$ 0