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Long-Term Debt -Fair Value of Long-Term Debt (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Feb. 17, 2012
2019 Senior Notes, due 2019 [Member]
Fair Value [Line Items]
Debt, short-term and long-term	$ 1,305.0	$ 1,305.0
Premium, unamortized	4.8	5.0	5.7
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value [Line Items]
Debt, short-term and long-term	3,676.0
Fair Value, Inputs, Level 2 [Member]
Fair Value [Line Items]
Long-term Debt, fair value disclosures	$ 3,938.1

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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