Common Equity (Tables)

3 Months Ended

Mar. 31, 2020

Equity [Abstract]

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

The following table calculates basic and diluted earnings (loss) per share for the Company.

	Three Months Ended March 31,
(In millions except per share data)	2020		2019
Net income (loss)	$	(491.8)	$	47.1
Average common shares outstanding:
Basic average common shares outstanding	200.2		199.9
Effect of dilutive securities:
Contingently issuable shares (performance and restricted stock units)	—		0.6
Diluted average common shares outstanding	200.2		200.5
Basic earnings (loss) per average common share	$	(2.46)	$	0.24
Diluted earnings (loss) per average common share	$	(2.46)	$	0.24
Anti-dilutive shares excluded from earnings per share calculation	—		—