Capital Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2010	Dec. 31, 2011
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Shares of common stock authorized		100,000,000		100,000,000
Shares issued and outstanding		47,800,000		46,900,000
Value of Shares Repurchased			$ 33.7
Number of Shares Repurchased			1,682,845
Average Price per Share for Shares Repurchased			$ 20.03
Value of Shares of Common Stock for Defined Benefit Plan Contribution		9.0
Date of shares issued for stock contribution		Mar. 06, 2012
Regular Quarterly Dividend Date Declared	Jan. 17, 2013
Regular Quarterly Dividend Payable - Amount per Share	$ 0.1
Regular Quarterly Dividend Date Payable	Mar. 01, 2013
Amount of Shares of Preferred Stock Authorized to be Issued		2,000,000
Common Stock, Value of Shelf Registration		$ 150
Common Stock Shares Available under Shelf Registration		141,500,000
Par Value of Preferred Stock Authorized to be Issued		$ 10