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New Accounting Standards (Details) - USD ($)
$ in Millions
Apr. 30, 2019
Feb. 01, 2019
Jan. 31, 2019
Apr. 30, 2018
Feb. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Lease liability $ 1,178.4        
Deferred gains on sale-leasebacks $ 0.0   $ 31.1 $ 38.0  
Cumulative effect adjustment from adoption of new accounting standards   $ 21.8     $ 3.9
Accounting Standards Update 2016-02          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Lease liability   1,200.0      
Deferred gains on sale-leasebacks   31.1      
Deferred tax assets (reclassified due to ASU)   (9.5)      
Accumulated Other Comprehensive Loss          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cumulative effect adjustment from adoption of new accounting standards   (26.0)     1.8
Accumulated Other Comprehensive Loss | Accounting Standards Update 2018-02          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cumulative effect adjustment from adoption of new accounting standards   (26.2)      
Retained Earnings          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cumulative effect adjustment from adoption of new accounting standards   47.8     $ 2.1
Retained Earnings | Accounting Standards Update 2018-02          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cumulative effect adjustment from adoption of new accounting standards   $ 26.2