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Segment Information - Reconciliation of Segments' Earnings from Operations to Company's Consolidated Earnings from Operations Before Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Segment Reporting [Abstract]    
Earnings from operations for segments $ 249.8 $ 195.0
Unallocated corporate expenses (45.5) (45.4)
Interest expense and financing costs (9.9) (10.6)
Other expense, net (3.9) (2.9)
Earnings from operations before income taxes $ 190.5 $ 136.1