Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Schedule Of Quarterly Financial Data

The following quarterly financial data for the years ended December 31, 2016 and 2015 has been prepared in accordance with GAAP:

(In millions, except per share data)	2016
	Quarters Ended
Income Statement Data	March 31		June 30		September 30		December 31
Revenue	$	227.9	$	238.5	$	246.6	$	256.2
Income before provision for income taxes	118.4		134.7		136.5		141.6
Net income	74.4		84.9		85.9		87.6
Net income per share (1):
Basic	$	3.64	$	4.17	$	4.22	$	4.35
Diluted	$	3.63	$	4.17	$	4.21	$	4.33
(In millions, except per share data)	2015
	Quarters Ended
Income Statement Data	March 31		June 30		September 30		December 31
Revenue	$	194.2	$	203.1	$	210.2	$	217.8
Income before provision for income taxes	113.3		117.4		117.9		125.9
Net income	71.5		74.2		74.0		80.0
Net income per share (1):
Basic	$	3.42	$	3.54	$	3.53	$	3.86
Diluted	$	3.41	$	3.54	$	3.53	$	3.84

(1) Basic and diluted net income per share are computed independently for each of the quarters presented. Therefore, the sum of quarterly basic and diluted per share information may not equal annual basic and diluted net income per share.