Employee Benefit Plans and Other Postretirement Plans - Schedule of Weighted-Average Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Company contributions	$ 57,100,000	$ 57,100,000	$ 400,000
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost, Expected return on plan assets	6.55%
Weighted-Average expected return on plan assets for 2016	6.55%
Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Company contributions	$ 58,200,000	$ 1,200,000
Weighted-Average Assumptions Used to Determine Benefit Obligation, Discount Rate	4.24%	4.51%	4.14%
Weighted-Average Assumptions Used to Determine Benefit Obligations, Rate of compensation increase	4.00%	4.00%	4.00%
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost, Discount rate	4.49%	4.14%	5.00%
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost, Expected return on plan assets	6.57%	6.73%	6.69%
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost, Rate of compensation increase	4.00%	4.00%	4.00%
Discount rate to calculate net periodic benefit cost for 2016	4.49%	4.14%	5.00%
Weighted-Average expected return on plan assets for 2016	6.57%	6.73%	6.69%
Postretirement Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Company contributions	$ 1,400,000	$ 2,000,000
Weighted-Average Assumptions Used to Determine Benefit Obligation, Discount Rate	3.91%	4.35%	3.95%
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost, Discount rate	4.17%	3.95%	4.85%
Discount rate to calculate net periodic benefit cost for 2016	4.17%	3.95%	4.85%