Income Per Common Share Computations (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

	Three Months Ended June 30,					Six Months Ended June 30,
(in millions, except per share data)	2018			2017		2018		2017
Numerator for basic net income per common share:
Net income from continuing operations	$	103.2		$	72.7	$	117.3	$	74.9
Net loss from continuing operations allocated to participating securities	—			—		—		(0.1		)
Net (loss) income from discontinued operations	(0.1		)	5.6		167.8		10.7
Numerator for basic net income per common share	$	103.1		$	78.3	$	285.1	$	85.5
Numerator for diluted net income from continuing operations per common share	$	103.2		$	72.7	$	117.3	$	74.9
Numerator for diluted net income per common share:	$	103.1		$	78.3	$	285.1	$	85.6
Denominator for net income per common share:
Basic	13.5			16.1		14.0		16.2
Plus dilutive effect of stock awards	0.1			0.2		0.1		0.2
Plus dilutive effect of participating securities	—			—		—		0.1
Diluted	13.6			16.3		14.1		16.5
Net income (loss) per common share data:
Basic
Continuing operations	$	7.61		$	4.52	$	8.38	$	4.62
Discontinued operations	$	(0.01	)	$	0.34	$	11.98	$	0.65
Net income per common share - basic	$	7.60		$	4.86	$	20.36	$	5.27
Diluted
Continuing operations	$	7.57		$	4.47	$	8.34	$	4.53
Discontinued operations	$	(0.02	)	$	0.34	$	11.92	$	0.65
Net income per common share - diluted	$	7.55		$	4.81	$	20.26	$	5.18