Earnings Per Share and Common Stock (Tables)

3 Months Ended

Mar. 31, 2013

Earnings Per Share and Common Stock [Abstract]

Reconciliation of Basic and Diluted Earnings Per Share [Table Text Block]

			2013					2012
Reconciliation of Basic and Diluted			Dilutive					Dilutive
Earnings Per Share	Basic		Securities	Diluted		Basic		Securities	Diluted
Millions Except Per Share Amounts
For the Quarter Ended March 31,
Net Income		$32.5			$32.5		$24.4			$24.4
Average Common Shares	38.9		0.1	39.0		36.8		0.1	36.9
Earnings Per Share		$0.83			$0.83		$0.66			$0.66