Debt (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Long-Term Debt
Long-term debt	$ 1,274.5	$ 1,016.1
Less: Current portion	250.0	0
Total long-term debt	1,024.5	1,016.1
5.000% notes due August 14, 2014 (the "2014 Notes") [Member]
Long-Term Debt
Carrying value of notes	450.0	450.0
6.125% notes due August 14, 2019 (the "2019 Notes") [Member]
Long-Term Debt
Carrying value of notes	400.0	400.0
Senior Notes [Member]
Long-Term Debt
Carrying value of notes	850.0	850.0
Less: Unamortized discount	(1.9)	(2.1)
Long-term debt	848.1	847.9
Senior Credit Facility with Canadian Imperial Bank of Commerce, Wachovia Capital Markets, LLC and a syndicate of banks ("2006 Credit Facility"), due 2011 [Member]
Long-Term Debt
Senior Credit Facility	250.0	0
Mandatorily Redeemable Preferred Stock [Member]
Long-Term Debt
Long-term debt	174.6	166.4
Notes Payable, Other Notes Payable [Member]
Long-Term Debt
Long-term debt	$ 1.8	$ 1.8

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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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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- Definition

The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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- Definition

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. 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, and after deducting unamortized discount or premiums, if any.

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