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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Statement of Comprehensive Income [Abstract]        
Unrealized losses on available-for-sale securities, tax $ 1.4 $ 0.0 $ 1.6 $ 0.0
Pension and post-retirement liability adjustments, tax $ (0.1) $ (0.1) $ (0.2) $ (0.2)