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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Statement of Comprehensive Income [Abstract]    
Unrealized gains (loss) on available-for-sale securities, tax $ (0.2) $ (0.3)
Pension and post-retirement liability adjustments, tax $ (0.1) $ (0.1)