Employee Retirement Benefit Plans-AOCI (Details) - USD ($)	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net (gain)/loss arising during the year	$ 13,900,000	$ (16,400,000)	$ (12,300,000)
Net (gain)/loss recognized during the year	4,300,000	3,400,000	3,100,000
Total Pension, pretax	18,700,000	(13,200,000)	$ (8,600,000)
Retirement Benefits [Member]
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net (gain)/loss arising during the year	(13,800,000)	16,400,000
Prior service cost (credit) during the year	0	(700,000)
Transition asset/(obligation) recognized during the year	0	0
Net (gain)/loss recognized during the year	0	0
Net gain/(loss) recognized during the year	(4,400,000)	(2,800,000)
Exchange rate gain/(loss) recognized during the year	(500,000)	200,000
Total Pension, pretax	(18,700,000)	13,100,000
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Arising During Period, Net of Tax	(15,500,000)	19,300,000
Estimated Amounts to be Amortized from Accumulated Other Comprehensive Income into Net Periodic Benefit Cost
Transition (asset)/obligation	0	0
Prior service cost/(credit)	0	0
Net (gain)/loss	$ 2,300,000	$ 4,500,000
Financial Assumptions Used to Determine Benefit Obligations at the Balance Sheet Date
Discount rate (percent)	2.49%	2.33%
Rate of compensation increases (percent)	2.09%	2.10%
Financial Assumptions Used to Determine Net Periodic Benefit Cost for Financial Year
Discount rate (percent)	2.33%	3.38%
Rate of compensation increases (percent)	2.09%	2.10%
Expected long-term rate of return (percent)	5.46%	4.93%
Expected Future Contributions
2018	$ 10,300,000
Other Post-Retirement Benefits [Member]
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net (gain)/loss arising during the year	(100,000)	$ 0
Prior service cost (credit) during the year	0	0
Transition asset/(obligation) recognized during the year	0	0
Net (gain)/loss recognized during the year	0	0
Net gain/(loss) recognized during the year	100,000	100,000
Exchange rate gain/(loss) recognized during the year	0	0
Total Pension, pretax	0	100,000
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Arising During Period, Net of Tax	(100,000)	100,000
Estimated Amounts to be Amortized from Accumulated Other Comprehensive Income into Net Periodic Benefit Cost
Transition (asset)/obligation	0	0
Prior service cost/(credit)	0	0
Net (gain)/loss	$ (100,000)	$ (100,000)
Financial Assumptions Used to Determine Benefit Obligations at the Balance Sheet Date
Discount rate (percent)	3.28%	2.89%
Financial Assumptions Used to Determine Net Periodic Benefit Cost for Financial Year
Discount rate (percent)	2.89%	3.69%
Expected Future Contributions
2018	$ 277,080