Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

Computation of Basic and Diluted Income Per Common 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						Six Months Ended
	June 30,						June 30,
Numerator:	2019			2018			2019			2018
Net income	$	193.6		$	186.6		$	380.4		$	326.7
Less: distributed and undistributed    earnings allocated to participating    securities		(1.5	)		(1.4	)		(2.9	)		(2.5	)
Net income attributable to common shareholders	$	192.1		$	185.2		$	377.5		$	324.2
Denominator:
Weighted average basic common shares    outstanding		93.8			93.6			93.8			93.6
Effect of dilutive securities		0.2			0.2			0.2			0.2
Weighted average diluted common shares    outstanding		94.0			93.8			94.0			93.8
Basic income per common share	$	2.05		$	1.98		$	4.03		$	3.46
Diluted income per common share	$	2.04		$	1.97		$	4.02		$	3.46