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Significant Accounting Policies (Narrative) (Details)
$ in Millions
12 Months Ended
Jan. 01, 2018
Dec. 22, 2017
Jun. 30, 2018
USD ($)
item
contract
Jun. 30, 2017
USD ($)
item
Jun. 30, 2016
USD ($)
item
Significant Accounting Policies [Line Items]          
Number of entities required to be consolidated | item     0 0 0
Number of deliverables identified for multiple element arrangements | item     2    
Research and development expenditures | $     $ 1.8 $ 2.0 $ 2.3
Income tax rate   35.00%      
Undistributed earnings | $     $ 545.4    
Minimum probability of tax benefit realization percentage     50.00%    
South Africa [Member]          
Significant Accounting Policies [Line Items]          
Income tax rate 28.00%   28.00% 28.00% 28.00%
Minimum [Member]          
Significant Accounting Policies [Line Items]          
Number of contracts in which reinsurers compensate losses arising on contracts it issues | contract     1