Consolidated Statements of Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net (loss) income	$ (54.7)	$ 11.2	$ 18.6
Other comprehensive income (loss), net of tax:
Foreign currency translation loss	(0.1)	0	(0.1)
Defined benefit plans:
Net gain (loss) arising from remeasurement during the period, net of tax of ($30.7), $5.1, $30.9	56.8	(9.2)	(56.5)
Net prior service credit, net of tax of ($6.1)	11.3	0	0
Amortization of prior service benefits included in net income, net of tax of $5.2, $4.8, $4.7	(8.7)	(8.3)	(8.2)
Amortization of net actuarial loss included in net income, net of tax of ($10.1), ($9.5), ($7.6)	17.5	16.7	13.2
Reclassification adjustment for curtailment (gain) loss included in net income, net of tax of $0.2, ($1.5)	(0.4)	0	2.7
Total other comprehensive income (loss), net of tax	76.4	(0.8)	(48.9)
Total comprehensive income (loss)	$ 21.7	$ 10.4	$ (30.3)