New Accounting Pronouncements - Deferred taxes (Details) - USD ($) $ in Millions	Jan. 30, 2016	Jan. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Non-current liabilities	$ (72.5)	$ (53.5)
Deferred tax assets (liabilities)	$ (492.9)	(449.8)
Adjustments for new accounting principle, early adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Current assets		0.0
Current liabilities		0.0
Non-current assets		2.3
Non-current liabilities		(53.5)
Deferred tax assets (liabilities)		(51.2)
Adjustments for new accounting principle, early adoption | As previously reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Current assets		4.5
Current liabilities		(145.8)
Non-current assets		111.1
Non-current liabilities		(21.0)
Deferred tax assets (liabilities)		(51.2)
Adjustments for new accounting principle, early adoption | Reclassifications
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Current assets		(4.5)
Current liabilities		145.8
Non-current assets		(108.8)
Non-current liabilities		(32.5)
Deferred tax assets (liabilities)		$ 0.0