Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net income (loss)	$ 94.1	$ (37.3)	$ 159.4	$ (48.6)
Other comprehensive income (loss)
Foreign currency translation adjustments	(9.0)	(5.9)	(7.1)	(1.2)
Unrealized loss on derivative instruments	0	0	0	(0.2)
Unrealized gain on marketable securities, net of reversals	0.9	0	1.2	0.2
Defined benefit pension plans	1.6	1.3	3.0	2.0
Other comprehensive income (loss), net of tax	(6.5)	(4.6)	(2.9)	0.8
Comprehensive income (loss)	$ 87.6	$ (41.9)	$ 156.5	$ (47.8)