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Retirement Benefits - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Jun. 30, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Contributions to defined benefit pension plans $ 2.4 $ 2.0 $ 7.1 $ 7.0  
Contribution amounts expected to be paid for the remainder of the fiscal year 2016 3.0   $ 3.0    
Retirement Savings Plan [Member]          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Maximum employees contribution rate, pretax     50.00%    
Safe harbor non-elective contribution rate     3.00%    
Matching contribution by employer     50.00%    
Matching contribution rate     6.00%    
Matching and profit contribution vesting rate     25.00%    
SERP [Member] | Irrevocable Trust [Member]          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Retirement benefits total plan assets 89.8   $ 89.8   $ 98.4
Retirement benefits cash and cash equivalents 0.1   0.1   6.1
Surrender value of life insurance policies 40.6   40.6   40.0
SERP [Member] | Irrevocable Trust [Member] | Equity and Fixed Income Mutual Funds [Member]          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Available-for-sale securities $ 49.1   $ 49.1   $ 52.3