Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net income (loss)	$ 2.1	$ 94.3	$ (12.1)	$ 159.4
Other comprehensive income (loss)
Foreign currency translation adjustments	0.7	(9.0)	(1.1)	(7.1)
Unrealized gain on marketable securities	0.4	0.9	0.5	1.2
Defined benefit pension plans	0.5	1.6	1.8	3.0
Other comprehensive income (loss), net of tax	1.6	(6.5)	1.2	(2.9)
Comprehensive income (loss)	$ 3.7	$ 87.8	$ (10.9)	$ 156.5