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Changes in Accumulated Other Comprehensive Income/(Loss) by Component (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Changes In Accumulated Other Comprehensive Income [Roll Forward]        
Balance, beginning $ (32.9) $ 5.7 $ (20.9) $ 10.3
Other comprehensive income/(loss) before reclassifications (5.1) (11.3) (17.3) (15.9)
Amounts reclassified from accumulated other comprehensive income 0.1 0.1 0.2 0.1
Balance, ending (38.0) (5.5) (38.0) (5.5)
Foreign Currency Translation [Member]        
Changes In Accumulated Other Comprehensive Income [Roll Forward]        
Balance, beginning (28.0) 9.1 (16.6) 13.6
Other comprehensive income/(loss) before reclassifications (5.4) (11.4) (17.0) (15.9)
Amounts reclassified from accumulated other comprehensive income 0.0 0.0 0.0 0.0
Balance, ending (33.5) (2.3) (33.5) (2.3)
Available-for-Sale Securities [Member]        
Changes In Accumulated Other Comprehensive Income [Roll Forward]        
Balance, beginning 1.4 1.8 2.0 1.9
Other comprehensive income/(loss) before reclassifications 0.3 0.1 (0.3) 0.0
Amounts reclassified from accumulated other comprehensive income 0.0 0.0 0.0 0.0
Balance, ending 1.7 1.9 1.7 1.9
Pension and Post-Retirement Liabilities [Member]        
Changes In Accumulated Other Comprehensive Income [Roll Forward]        
Balance, beginning (6.3) (5.2) (6.3) (5.2)
Other comprehensive income/(loss) before reclassifications 0.0 0.0 0.0 0.0
Amounts reclassified from accumulated other comprehensive income 0.1 0.1 0.2 0.1
Balance, ending $ (6.2) $ (5.1) $ (6.2) $ (5.1)