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Other Financial Data (Tables)
 12 Months Ended
May 31, 2018
Other Financial Data Disclosure [Abstract]  
Schedule of other financial data
Other financial data consisted of the following for the fiscal years ended May 31: 
 
2018
 
2017
 
2016
Advertising expense
$
110.0

 
$
121.0

 
$
127.3

Amortization of prepublication and production costs
21.8

 
23.3

 
26.4

Foreign currency transaction gain (loss)
(0.0
)
 
1.0

 
(0.5
)
Purchases related to contractual commitments for minimum print quantities
54.2

 
53.1

 
48.7


Other financial data consisted of the following at May 31: 

 
2018
 
2017
Royalty advances allowance for reserves
$
97.0

 
$
93.8

Accounts receivable reserve for returns
30.0

 
36.3

Accounts receivable allowance for doubtful accounts
12.4

 
13.7