CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	$ 235.5	$ (16.6)
Other comprehensive income (loss):
Foreign currency translation gain (loss)	0.4	(3.1)
Defined benefit pension plan:
Actuarial loss arising during period, net of tax		(2.1)
Less: amortization of actuarial loss and prior service cost included in net periodic pension cost, net of tax	0.2	0.3
Total defined benefit pension plan, net	0.2	(1.8)
Other comprehensive income (loss), net of tax	0.6	(4.9)
Comprehensive income (loss)	$ 236.1	$ (21.5)