Condensed Consolidated Statements of Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Net income (loss)	$ 49.2	$ 7.0
Other comprehensive income, net of tax:
Foreign currency translation loss (gain)	(0.3)	0
Defined benefit pension and postretirement plans:
Amortization of prior service benefits, net of tax of ($1.4), ($1.4)	(2.4)	(2.4)
Amortization of net actuarial loss (gain), net of tax of $2.3, $2.4	4.1	4.2
Other comprehensive income (loss)	1.4	1.8
Total comprehensive income (loss)	$ 50.6	$ 8.8