Earnings Per Share and Shareholders' Equity Transactions (Tables)

9 Months Ended

Sep. 30, 2017

Earnings Per Share [Abstract]

Information Regarding Basic and Diluted Earnings Per Share

The following table provides weighted average share information used in the calculation of the Company’s basic and diluted earnings per share:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
(in millions, except per share data)	2017			2016			2017			2016
Basic shares used in the calculation of earnings per share		42.4			42.7			42.5			42.8
Dilutive effect of securities:
Employee stock options		0.3			0.2			0.2			0.3
Non-vested stock grants		0.2			0.1			0.2			0.2
Diluted shares used in the calculation of earnings per share		42.9			43.0			42.9			43.3
Per share effect of dilutive securities on income from    continuing operations	$	(0.01	)	$	(0.01	)	$	(0.03	)	$	(0.04	)
Per share effect of dilutive securities on net income	$	—		$	(0.01	)	$	(0.03	)	$	(0.05	)