Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2016

Earnings Per Share [Abstract]

Comparison of basic and diluted earnings per share

The following table sets forth the comparison of basic and diluted earnings per share:

	Three Months Ended   June 30,				Six Months Ended   June 30,
	2016		2015		2016		2015
Basic earnings per share:
Net income	$	153.4	$	9.5	$	227.5	$	133.8
Weighted average common shares outstanding	88,742,484		92,441,730		89,495,564		94,178,989
Basic earnings per share	$	1.73	$	0.10	$	2.54	$	1.42

	Three Months Ended   June 30,				Six Months Ended   June 30,
	2016		2015		2016		2015
Diluted earnings per share:
Net income	$	153.4	$	9.5	$	227.5	$	133.8
Weighted average common shares outstanding	88,742,484		92,441,730		89,495,564		94,178,989
Share equivalents:
Stock options	829,584		1,075,735		832,432		1,102,252
RSUs and performance-based equity awards	443,336		452,938		479,038		534,653
Employee share purchase plan	25,105		13,823		23,780		14,561
Weighted average common shares and common share equivalents outstanding - diluted	90,040,509		93,984,226		90,830,814		95,830,455
Diluted earnings per share	$	1.70	$	0.10	$	2.50	$	1.40