Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net income (loss)	$ 389.8	$ 149.8	$ (88.1)
Other comprehensive income (loss), net of tax
Foreign currency translation adjustment	6.6	8.8	(21.4)
Unrealized gain (losses) on securities, net of reversals	0.8	(0.6)	0.7
Defined benefit pension and post retirement plans:
Change benefit obligations, translation adjustment	(0.4)	(0.5)	1.2
Prior service cost	0.0	0.0	0.0
Net gain (loss)	2.5	(2.9)	(0.4)
Amortization of actuarial loss, net of tax	6.1	3.5	4.6
Amortization of prior service cost, net of tax	0.3	0.3	0.3
Other	(0.8)	0.3	0.2
Other comprehensive income (loss), net of tax	15.1	8.9	(14.8)
Comprehensive income (loss)	$ 404.9	$ 158.7	$ (102.9)