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Fair Value Measurements Fair Value Measurements, Financial Instruments (Details) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Financial Instruments
Preferred stock of subsidiary	$ 30.4	$ 30.4
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Financial Instruments
Preferred stock of subsidiary	30.4	30.4
Long-term debt including current portion	4,543.3	4,288.0
Estimate of Fair Value, Fair Value Disclosure [Member]
Financial Instruments
Preferred stock of subsidiary	22.9	23.5
Long-term debt including current portion	$ 5,160.3	$ 4,578.0

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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