The following table sets forth the computation of basic and diluted net income attributable to common stockholders per share (in millions, except per share data):



	Three Months Ended
	September 29, 2018			September 30, 2017
Basic Earnings per Common Share
Net income	$	47.4		$	7.1
Less: Cumulative dividends on Series A Preferred Stock	(0.2		)	(0.2		)
Less: Earnings allocated to Series A Preferred Stock	(1.1		)	(0.2		)
Net income attributable to common stockholders - Basic	$	46.1		$	6.7

Weighted average common shares outstanding including Series A Preferred Stock	64.6			63.2
Less: Weighted average Series A Preferred Stock	(1.5		)	(1.5		)
Basic weighted average common shares outstanding	63.1			61.7
Net income per share attributable to common stockholders - Basic	$	0.73		$	0.11

Diluted Earnings per Common Share
Net income attributable to common stockholders - Basic	$	46.1		$	6.7
Add: Earnings allocated to Series A Preferred Stock	—			0.2
Add/Less: Unrealized (gain) loss on derivative liability on Series A Preferred Stock	—			(4.2		)
Add: Cumulative dividends on Series A Preferred Stock	—			0.2
Net income attributable to common stockholders - Diluted ^(a)	$	46.1		$	2.9
Weighted average common shares outstanding for basic earnings per common share	63.1			61.7
Effect of dilutive securities from 2015 Equity Incentive Plan	0.8			1.3
Effect of dilutive securities from Series A Preferred Stock	—			1.5
Diluted weighted average common shares outstanding	63.9			64.5
Net income per share attributable to common stockholders - Diluted	$	0.72		$	0.04

(a) For the three months ended September 30, 2017, our diluted earnings per share attributable to common stockholders is calculated using the if-converted method because it is more dilutive, whereas for the three months ended September 29, 2018, our diluted earnings per share attributable to common stockholders is calculated using the treasury stock method.