Equity - Accumulated other comprehensive income (Details) - USD ($) $ in Thousands	6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 5,865,493	$ 5,267,346
Impact of adoption of ASU 2016-01			$ (251)
Ending balance	5,821,166	5,519,210
Foreign Currency Translation Adjustment and Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(943,477)	(925,342)
Impact of adoption of ASU 2016-01			(1,734)
Other comprehensive income (loss) before reclassifications	(82,655)	101,429
Amounts reclassified from accumulated other comprehensive (loss)	3,578	0
Ending balance	(1,024,288)	(823,913)
Retirement Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(819,609)	(998,862)
Impact of adoption of ASU 2016-01			0
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive (loss)	48,400	55,047
Ending balance	(771,209)	(943,815)
Accumulated Other Comprehensive (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,763,086)	(1,924,204)
Impact of adoption of ASU 2016-01			$ (1,734)
Other comprehensive income (loss) before reclassifications	(82,655)	101,429
Amounts reclassified from accumulated other comprehensive (loss)	51,978	55,047
Ending balance	$ (1,795,497)	$ (1,767,728)