Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Condensed Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 3.9	$ 17.6	$ 21.0	$ 49.0
Other Comprehensive Income, Net of Tax [Abstract]
Foreign Currency Translation Gain	0.1	0	0.1	0
Defined benefit pension and postretirement plans: [Abstract]
Net gain arising from remeasurement during the period, net of tax of $0.9	0	0	0	1.4
Amortization of prior service benefits included in net income, net of tax of ($1.2), ($1.1), ($3.5), ($3.5)	(2.0)	(2.1)	(6.2)	(6.1)
Amortization of net actuarial loss included in net income, net of tax of $2.2, $1.9, $7.0, $5.7	4.2	3.4	12.5	9.9
Reclassifiation Adjustment for Curtailments Included In Net Income, Net of Tax	0	0	0	2.7
Other comprehensive income	2.3	1.3	6.4	7.9
Total comprehensive income	$ 6.2	$ 18.9	$ 27.4	$ 56.9