Condensed Consolidated Statements of Comprehensive Income (Loss) (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)	$ 114.2	$ 0.8	$ 121.2	$ (35.9)
Other comprehensive income, net of tax:
Foreign currency translation gain (loss), net of tax of $0.0, ($0.1)	0	0.1	0	(0.1)
Defined benefit pension and postretirement plans:
Net gain arising from remeasurement during the period, net of tax of $4.2	0	7.3	0	7.3
Amortization of prior service benefits, net of tax of ($1.4), ($1.2), ($2.8), ($2.4)	(2.4)	(2.0)	(4.8)	(4.0)
Amortization of net actuarial loss, net of tax of $1.8, $2.3, $4.2, $5.1	3.0	4.0	7.2	8.8
Reclassification adjustment for curtailment gain included in net income, net of tax of ($0.2)	0	(0.4)	0	(0.4)
Other comprehensive income	0.6	9.0	2.4	11.6
Total comprehensive income (loss)	$ 114.8	$ 9.8	$ 123.6	$ (24.3)