Earnings Per Share - Computation of Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended
		Sep. 29, 2018	Sep. 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 (in shares)		64.6	63.2
Less: Weighted average Series A Preferred Stock (in shares)		(1.5)	(1.5)
Basic weighted average common shares outstanding (in shares)		63.1	61.7
Net income (loss) per share attributable to common stockholders - Basic (usd per share)		$ 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		0.0	0.2
Add/Less: Unrealized (gain) loss on derivative liability on Series A Preferred Stock		0.0	(4.2)
Add: Cumulative dividends on Series A Preferred Stock		0.0	0.2
Net income attributable to common stockholders - Diluted	[1]	$ 46.1	$ 2.9
Weighted average common shares outstanding for basic earnings per common share (in shares)		63.1	61.7
Effect of dilutive securities from 2015 Equity Incentive Plan (in shares)		0.8	1.3
Effect of diluted securities from Series A Preferred Stock (in shares)		0.0	1.5
Diluted weighted average common shares outstanding (in shares)		63.9	64.5
Net income (loss) per share attributable to common stockholders - Diluted (usd per share)		$ 0.72	$ 0.04

[1] (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.