Earnings Per Share and Common Stock (Tables)

9 Months Ended

Sep. 30, 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 September 30,
Net Income		$25.2			$25.2		$29.4			$29.4
Average Common Shares	39.8		0.1	39.9		37.7		0.1	37.8
Earnings Per Share		$0.63			$0.63		$0.78			$0.78
For the Nine Months Ended September 30,
Net Income		$71.7			$71.7		$68.2			$68.2
Average Common Shares	39.4		0.1	39.5		37.3		—	37.3
Earnings Per Share		$1.82			$1.81		$1.83			$1.83