Earnings Per Share and Common Stock (Tables)

9 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

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

			2019					2018
Reconciliation of Basic and Diluted			Dilutive					Dilutive
Earnings Per Share	Basic		Securities	Diluted		Basic		Securities	Diluted
Millions Except Per Share Amounts
Quarter ended September 30,
Net Income		$31.2			$31.2		$30.7			$30.7
Average Common Shares	51.7		0.1	51.8		51.4		0.2	51.6
Earnings Per Share	$0.60			$0.60			$0.59			$0.59
Nine Months Ended September 30,
Net Income		$135.9			$135.9		$113.0			$113.0
Average Common Shares	51.6		0.1	51.7		51.3		0.2	51.5
Earnings Per Share	$2.63			$2.63			$2.20			$2.19