Pension and Other Benefits (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 31, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Pension Benefits
Components of net periodic benefit cost [Line Items]
Service cost		$ 4,500,000	$ 3,800,000	$ 9,000,000	$ 7,500,000
Interest cost		10,100,000	10,200,000	20,200,000	20,400,000
Expected return on plan assets		(13,400,000)	(11,300,000)	(26,600,000)	(22,600,000)
Amortization of prior service cost		0	0	0	100,000
Amortization of actuarial losses/(gains)		3,000,000	900,000	5,900,000	1,800,000
NET PERIODIC BENEFIT COST		4,200,000	3,600,000	8,500,000	7,200,000
Other Benefits
Components of net periodic benefit cost [Line Items]
Service cost		0	0	0	0
Interest cost		300,000	400,000	600,000	600,000
Expected return on plan assets		0	0	0	0
Amortization of prior service cost		(300,000)	(200,000)	(500,000)	(400,000)
Amortization of actuarial losses/(gains)		0	(100,000)	0	(100,000)
NET PERIODIC BENEFIT COST		$ 0	$ 100,000	100,000	$ 100,000
Domestic Plan
Components of net periodic benefit cost [Line Items]
Contribution to defined benefit pension plans	$ 20,000,000			0
Foreign Plan
Components of net periodic benefit cost [Line Items]
Contribution to defined benefit pension plans				1,700,000
Defined benefit plan estimated total employer contributions in current fiscal year				$ 2,800,000