Consolidated Stockholders' Equity Statements (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Adjustments to pension and postretirement liability, tax benefit	$ 4.8	$ 1.0	$ 0.8
Dividends declared per share	$ 0.20	$ 0.20	$ 0.20
Paid-In Capital
Dividends declared per share	$ 0.20	$ 0.20	$ 0.20
Retained Earnings
Dividends declared per share	$ 0.20	$ 0.20	$ 0.20
Accumulated Other Comprehensive Income (Loss), Pension and Postretirement Liability
Adjustments to pension and postretirement liability, tax benefit	$ 4.8	$ 1.0	$ 0.8