Earnings (Loss) per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Dec. 25, 2015	Dec. 26, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0.6	0.0
Income from continuing operations attributable to common shareholders before allocation of earnings to participating securities	$ 115.9	$ 87.4
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	0.0	1.0
Income from continuing operations attributable to common shareholders, after earnings allocated to participating securities	115.9	86.4
Income from discontinued operations, net of income taxes	95.2	5.3
Less: earnings from discontinued operations allocated to participating securities	0.0	0.1
Income from discontinued operations attributable to common shareholders, after allocation of earnings to participating securities	95.2	5.2
Net income attributable to common shareholders, after allocation of earnings to participating securities	$ 211.1	$ 91.6
Weighted-average shares outstanding - basic (in shares)	115.4	114.8
Impact of dilutive securities (in shares)	0.9	1.5
Weighted-average shares outstanding - diluted (in shares)	116.3	116.3
Income from continuing operations (in usd per share)	$ 1.00	$ 0.75
Loss from discontinued operations (in usd per share)	0.82	0.05
Net income (in usd per share)	1.83	0.80
Income from continuing operations (in usd per share)	1.00	0.74
Loss from discontinued operations (in usd per share)	0.82	0.05
Net income attributable to common shareholders (in usd per share)	$ 1.82	$ 0.79