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Employees, Retirement and Incentive Plans Retirement and Benefit Plan Costs (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Components Types	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Benefits and Share-based Compensation	$ 3.6	$ 2.9	$ 2.8
Long-term Incentive Plan, Components	4
Equity-based Compensation, Types	2
Share-based Compensation	2.1	2.2	1.2
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	350,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	60,604
Retirement Costs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Benefits and Share-based Compensation	$ 2.2	$ 1.5	$ 1.6

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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