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Fair Value (Tables)

12 Months Ended

Dec. 31, 2012

Fair Value [Abstract]

Recurring Fair Value Measures [Table Text Block]

	Fair Value as of December 31, 2012
Recurring Fair Value Measures	Level 1				Level 2				Level 3			Total
Millions
Assets:
Investments
Available-for-sale Securities – Equity Securities		$18.0			—				—				$18.0
Available-for-sale Securities – Corporate Debt Securities	—					$8.8			—			8.8
Cash Equivalents	20.7				—				—			20.7
Total Fair Value of Assets		$38.7				$8.8			—				$47.5
Liabilities:
Deferred Compensation	—					$14.0			—				$14.0
Derivatives – Interest Rate Swap	—				0.7				—			0.7
Total Fair Value of Liabilities	—					$14.7			—				$14.7
Total Net Fair Value of Assets (Liabilities)		$38.7			$(5.9)				—				$32.8

	Fair Value as of December 31, 2011
Recurring Fair Value Measures	Level 1				Level 2				Level 3			Total
Millions
Assets:
Investments
Available-for-sale Securities – Equity Securities		$17.6			—				—				$17.6
Available-for-sale Securities – Corporate Debt Securities	—					$8.2			—			8.2
Cash Equivalents	11.4				—				—			11.4
Total Fair Value of Assets		$29.0				$8.2			—				$37.2
Liabilities:
Deferred Compensation	—					$12.8			—				$12.8
Derivatives – Interest Rate Swap	—					$0.4			—				$0.4
Total Fair Value of Liabilities	—					$13.2			—				$13.2
Total Net Fair Value of Assets (Liabilities)		$29.0			$(5.0)				—				$24.0

Recurring Fair Value Measures - Activity in Level 3 [Table Text Block]

Recurring Fair Value Measures Activity in Level 3	Debt Securities Issued by States of the United States (ARS)
Millions
Balance as of December 31, 2010		$6.7
Redeemed During the Period (a)	(6.7		)
Balance as of December 31, 2011		$—

(a) The ARS were redeemed at carrying value on January 5, 2011.

Financial Instruments [Table Text Block]

Financial Instruments	Carrying Amount			Fair Value
Millions
Long-Term Debt, Including Current Portion
December 31, 2012		$1,018.1			$1,143.7
December 31, 2011		$863.3			$966.4

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Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.

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Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value.

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Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

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