Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net income (loss)	$ 38.1	$ 31.3	$ 197.5	$ (17.3)
Other comprehensive income (loss)
Foreign currency translation adjustments	0.3	2.9	(6.8)	1.7
Unrealized loss on derivative instrument	(0.1)	(0.5)	(0.1)	(0.7)
Unrealized gain (loss) on marketable securities, net of reversals	(0.2)	0.5	1.0	0.7
Defined benefit pension plans	1.0	0.7	4.0	2.7
Other comprehensive income (loss), net of tax	1.0	3.6	(1.9)	4.4
Comprehensive income (loss)	$ 39.1	$ 34.9	$ 195.6	$ (12.9)