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Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 5.47% notes due May 2013	May 15, 2003 5.47% notes due May 2013	Dec. 31, 2011 5.85% notes due April 2016	Dec. 31, 2011 5.05% notes due June 2020
Senior notes
Interest rate (as a percent)			5.47%	5.47%	5.85%	5.05%
Long-term debt
Carrying amount	$ 399.4	$ 378.7
Estimated fair value	$ 440.5	$ 407.5

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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