Earnings (Loss) per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Dec. 30, 2016	Dec. 25, 2015
Earnings Per Share, by Common Class, Including Two Class Method [Line Items]
Income from discontinued operations, net of income taxes	$ 23.6	$ 107.3
Weighted-average shares outstanding - basic (in shares)	105.7	115.4
Impact of dilutive securities (in shares)	0.0	0.9
Weighted-average shares outstanding - diluted (in shares)	105.7	116.3
Income from continuing operations per share	$ (1.67)	$ 0.90
Income (loss) from discontinued operations, per share	0.22	0.93
Net income, per share	(1.45)	1.83
Income from continuing operations, per share	(1.67)	0.89
Income (loss) from discontinued operations, per share	0.22	0.92
Net income attributable to common shareholders (in usd per share)	$ (1.45)	$ 1.82