Common Equity (Tables)

6 Months Ended

Jun. 30, 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:

	Three Months Ended June 30,				Six Months Ended June 30,
(In millions except per share data)	2017		2016		2017		2016
Net income	$	104.8	$	71.5	$	140.8	$	96.7
Average Common Shares Outstanding
Basic average common shares outstanding	199.7		199.7		199.7		199.7
Effect of dilutive securities:
Contingently issuable shares (performance and restricted stock units)	0.2		0.1		0.3		0.1
Diluted average common shares outstanding	199.9		199.8		200.0		199.8
Basic Earnings Per Average Common Share	$	0.52	$	0.35	$	0.70	$	0.48
Diluted Earnings Per Average Common Share	$	0.52	$	0.35	$	0.70	$	0.48
Anti-dilutive shares excluded from earnings per share calculation	—		—		—		—