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Earnings Per Share and Common Stock (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

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

					2018											2017
Reconciliation of Basic and Diluted					Dilutive											Dilutive
Earnings Per Share	Basic				Securities			Diluted				Basic				Securities			Diluted
Millions Except Per Share Amounts
Three Months Ended March 31,
Net Income		$51.0							$51.0				$49.0							$49.0
Average Common Shares	51.2				0.2			51.4				50.2				0.2			50.4
Earnings Per Share		$1.00							$0.99				$0.97							$0.97

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- References

No definition available.

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- Definition

Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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