Unaudited Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Data

(in millions, except per share amounts)	1st Quarter		2ndQuarter		3rd Quarter			4th Quarter		Year
2015
Total revenue	$	371.4	$	373.1	$	371.0		$	369.1	$	1,484.6
Net income before income taxes		62.4		34.7		36.2			44.2		177.5
Net income		58.8		27.9		35.3			41.2		163.2
Net income per common share :
Basic*	$	2.09	$	1.00	$	1.27		$	1.48	$	5.84
Diluted*	$	2.05	$	0.98	$	1.24		$	1.44	$	5.72
Comprehensive income (loss)	$	36.8	$	18.9	$	(18.3	)	$	29.2	$	66.6

(in millions, except per share amounts)	1st Quarter		2ndQuarter		3rd Quarter		4th Quarter		Year
2014
Total revenue	$	360.1	$	375.2	$	371.3	$	412.1	$	1,518.7
Net income before income taxes		42.7		44.7		48.3		80.3		216.0
Net income		40.2		38.6		44.7		59.7		183.2
Net income per common share :
Basic*	$	1.38	$	1.34	$	1.57	$	2.11	$	6.39
Diluted*	$	1.36	$	1.32	$	1.54	$	2.07	$	6.27
Comprehensive income	$	41.3	$	64.1	$	6.8	$	31.3	$	143.5

* Basic and diluted net income per common share are computed independently for each quarter and full year based on the respective average number of common shares outstanding; therefore, the sum of the quarterly net income per common share data may not equal the net income per common share for the year.