Investment in Affiliate	12 Months Ended
Investment in Affiliate	Dec. 31, 2011
Investment in Affiliate [Abstract]
Investment in Affiliate	6. Investment in Affiliate Cepolk Holdings, Inc., a subsidiary within the Climate Control Business, is a limited partner and has a 50% equity interest in Cepolk Limited Partnership (“Partnership”), which is accounted for on the equity method. The Partnership owns an energy savings project located at the Ft. Polk Army base in Louisiana. The income recognized from the Partnership is reported as equity in earnings of affiliate.

The entire disclosure for equity investment, or group of investments, for which combined disclosure is appropriate, including: (a) the name of each investee and percentage of ownership of common stock, (b) accounting policies for investments in common stock, (c) difference between the amount at which the investment is carried and the amount of underlying equity in net assets and the accounting treatment of the difference, (d) the total fair value of each identified investment for which a market value is available, (e) summarized information as to assets, liabilities, and results of operations of the investees (for investments in unconsolidated subsidiaries, common stock of joint ventures, or other investments using the equity method), and (f) material effects of possible conversions, exercises, or contingent issuances of the investee. Other disclosures include (a) the names of any investee in which the investor owns 20 percent or more of the voting stock and investment is not accounted for using the equity method, and the reasons why not, and (b) the names of any investee in which the investor owns less than 20 percent of the voting stock and the investment is accounted for using the equity method, and the reasons why it is.

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