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Fair Value Measurements (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Financial Instruments
Preferred Stock	$ 30.4	$ 30.4
Long-term debt including current portion, carrying value	4,772.9	4,541.4
Long-term debt including current portion, fair value	5,447.3	5,179.9
Fair Value [Member]
Financial Instruments
Preferred Stock	26.0	25.1
Carrying Amount [Member]
Financial Instruments
Preferred Stock	$ 30.4	$ 30.4

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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- Definition

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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