Pension and Other Postretirement Benefits (Details) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Pension Plans
Pension and Other Postretirement Benefit Disclosures
Service cost	$ 7,800,000	$ 8,000,000	$ 23,400,000	$ 24,000,000
Interest cost	14,400,000	13,500,000	43,200,000	40,500,000
Expected return on plan assets	(16,400,000)	(17,200,000)	(49,300,000)	(51,600,000)
Amortization of net loss	6,800,000	4,200,000	20,500,000	12,600,000
Amortization of prior service cost (benefit)	100,000	100,000	300,000	300,000
Net periodic benefit costs	12,700,000	8,600,000	38,100,000	25,800,000
Contributions			0	5,500,000
Defined benefit pension plan, expected contributions during the remainder of fiscal year 2015			0
Other Postretirement Plans
Pension and Other Postretirement Benefit Disclosures
Service cost	800,000	1,100,000	2,500,000	3,300,000
Interest cost	2,500,000	3,000,000	7,700,000	9,000,000
Expected return on plan assets	(1,700,000)	(1,700,000)	(5,200,000)	(5,000,000)
Amortization of net loss	700,000	500,000	2,000,000	1,500,000
Amortization of prior service cost (benefit)	(1,600,000)	0	(4,800,000)	0
Net periodic benefit costs	$ 700,000	$ 2,900,000	$ 2,200,000	$ 8,800,000