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Common Equity (Tables)

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

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

Basic and diluted earnings per share for the Company were calculated as follows:

(In millions except per share data)	2017			2016			2015
Net income	$	619.0		$	338.2		$	271.3
Average common shares outstanding:
Basic average common shares outstanding	199.7			199.7			199.6
Effect of dilutive securities:
Contingently issuable shares (performance and restricted stock units)	0.3			0.2			—
Diluted average common shares outstanding	200.0			199.9			199.6
Basic earnings per average common share	$	3.10		$	1.69		$	1.36
Diluted earnings per average common share	$	3.10		$	1.69		$	1.36
Anti-dilutive shares excluded from earnings per share calculation	—			—			—

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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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