Earnings per Common Share (Tables)

6 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Schedule of calculations of basic and diluted earnings per common share

The calculations of basic and diluted earnings per common share for the three and six months ended December 31, 2017 and 2016 were as follows: 

	Three Months Ended December 31,						Six Months Ended December 31,
(in millions, except per share data)	2017			2016			2017			2016
Net income	$	92.1		$	7.0		$	115.5		$	0.8
Less: earnings and dividends allocated to participating securities	(0.9		)	(0.1		)	(1.0		)	(0.1		)
Earnings available for common stockholders used in calculation of basic earnings per common share	$	91.2		$	6.9		$	114.5		$	0.7
Weighted average number of common shares outstanding, basic	47.2			47.0			47.1			47.0
Basic earnings per common share	$	1.93		$	0.15		$	2.43		$	0.01
Net income	$	92.1		$	7.0		$	115.5		$	0.8
Less: earnings and dividends allocated to participating securities	(0.9		)	(0.1		)	(1.0		)	(0.1		)
Earnings available for common stockholders used in calculation of diluted earnings per common share	$	91.2		$	6.9		$	114.5		$	0.7
Weighted average number of common shares outstanding, basic	47.2			47.0			47.1			47.0
Effect of shares issuable under share-based compensation plans	0.4			0.1			0.4			0.1
Weighted average number of common shares outstanding, diluted	47.6			47.1			47.5			47.1
Diluted earnings per common share	$	1.92		$	0.15		$	2.41		$	0.01

Schedule of awards issued under share-based compensation plans excluded from the calculations of diluted earnings per share

The following awards issued under share-based compensation plans were excluded from the above calculations of diluted earnings per share because their effects were anti-dilutive:

	Three Months Ended December 31,		Six Months Ended December 31,
(in millions)	2017	2016	2017	2016
Stock options	0.6	2.0	0.8	1.8