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Debt (Tables)
 3 Months Ended
Apr. 30, 2018
Debt Disclosure [Abstract]  
Short-term Debt
(in millions)
April 30, 2018
 
January 31, 2018
 
April 30, 2017
Short-term borrowings:
 
 
 
 
 
Credit Facilities
$
26.1

 
$
33.5

 
$
93.6

Other credit facilities
70.6

 
87.1

 
97.0

 
$
96.7

 
$
120.6

 
$
190.6
Long-term Debt
Long-term debt:
 
 
 
 
 
Unsecured Senior Notes:
 
 
 
 
 
2012 4.40% Series B Senior Notes, due July 2042 a
$
250.0

 
$
250.0

 
$
250.0

2014 3.80% Senior Notes, due October 2024 b, c
250.0

 
250.0

 
250.0

2014 4.90% Senior Notes, due October 2044 b, c
300.0

 
300.0

 
300.0

2016 0.78% Senior Notes, due August 2026 b, d
91.7

 
91.9

 
89.9

 
891.7

 
891.9

 
889.9

Less unamortized discounts and debt issuance costs
8.8

 
9.0

 
9.4

 
$
882.9

 
$
882.9

 
$
880.5