Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Reconciliation of Earnings to Earnings Attributable to Common Shares Used in Basic and Diluted Calculation

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2018			2017			2018			2017
Earnings from continuing operations	$	64.2		$	37.3		$	153.0		$	116.5
Earnings allocated to participating non-vested share awards		(0.2	)		(0.1	)		(0.5	)		(0.4	)
Earnings from continuing operations attributable to common shares	$	64.0		$	37.2		$	152.5		$	116.1

Reconciliation of Basic Shares Outstanding to Diluted Shares Outstanding

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2018		2017		2018		2017
Basic shares outstanding		50.7		53.0		51.9		53.5
Dilutive effect of common stock equivalents		1.2		0.5		0.9		0.4
Diluted shares outstanding		51.9		53.5		52.8		53.9