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Significant Accounting Policies (Restricted Assets) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Summary of Significant Accounting Policies [Abstract]
Restricted cash and cash equivalents	$ 0.2	$ 0.8
Investment securities held by trustees or agencies	$ 26.5	$ 25.5

The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

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