Capital Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2012
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Shares of common stock authorized	100,000,000
Shares issued and outstanding	46,900,000	46,400,000
Board of directors authorized amount for stock repurchases				$ 100
Value of Shares Repurchased		33.7	6.1	60.2
Number of Shares Repurchased		1,682,845	234,456	1,044,300
Average Price per Share for Shares Repurchased		$ 20.03	$ 26.2	$ 57.58
Cash Portion of Voluntary Contribution to Pension Plan			92.4
Value of Shares of Common Stock for Defined Benefit Plan Contribution			57.6
Regualr Quarterly Dividend Date Declared	Jan. 19, 2012
Regular Quarterly Dividend Payable - Amount per Share	$ 0.1
Regualr Quarterly Dividend Date Payable	Mar. 01, 2012
Amount of Shares of Preferred Stock Authorized to be Issued	2,000,000
Common Stock, Value of Shelf Registration					$ 150
Par Value of Preferred Stock Authorized to be Issued	$ 10