Fair Value Measurements (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Financial Instruments
Preferred Stock	$ 30.4	$ 30.4
Long-term debt including current portion, carrying value	4,541.4	4,288.0
Long-term debt including current portion, fair value	5,179.9	4,578.0
Fair Value [Member]
Financial Instruments
Preferred Stock	25.1	23.5
Carrying Amount [Member]
Financial Instruments
Preferred Stock	$ 30.4	$ 30.4

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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Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.

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