Earnings Per Share

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Earnings Per Share

5. Earnings Per Share

The following table sets forth the computation of basic and diluted income per common share for the periods presented (dollars and shares in millions, except per share data):

	Three Months Ended
	March 31,
Numerator:	2018			2017
Net income	$	140.1		$	117.4
Less: distributed and undistributed earnings allocated to participating securities		(1.1	)		(1.0	)
Net income attributable to common shareholders	$	139.0		$	116.4
Denominator:
Weighted average basic common shares outstanding		93.6			93.4
Effect of dilutive securities		0.2			0.2
Weighted average diluted common shares outstanding		93.8			93.6
Basic income per common share	$	1.48		$	1.25
Diluted income per common share	$	1.48		$	1.24