Retirement and Other Postretirement Benefit Plans - Schedule of Actual Allocations for the Pension Assets and Target Allocations by Asset Class (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Change in plan assets:
Total plan assets invested in active corporate bond funds (as a percent)	100.00%	100.00%
Target allocations by asset class (as a percent)	100.00%	100.00%
Diversified Growth Funds
Change in plan assets:
Total plan assets invested in active corporate bond funds (as a percent)	27.60%	27.60%
Target allocations by asset class (as a percent)	27.00%	32.00%
Liability Driven Investments
Change in plan assets:
Total plan assets invested in active corporate bond funds (as a percent)	22.30%	23.40%
Target allocations by asset class (as a percent)	22.00%	20.00%
All Other Regions Equity Fund
Change in plan assets:
Total plan assets invested in active corporate bond funds (as a percent)	19.30%	19.50%
Target allocations by asset class (as a percent)	20.00%	23.00%
U.K. Equity Fund
Change in plan assets:
Total plan assets invested in active corporate bond funds (as a percent)	13.00%	13.00%
Target allocations by asset class (as a percent)	15.00%	15.00%
Debt Securities
Change in plan assets:
Total plan assets invested in active corporate bond funds (as a percent)	8.70%	8.90%
Target allocations by asset class (as a percent)	9.00%	10.00%
Index Linked Gilts
Change in plan assets:
Total plan assets invested in active corporate bond funds (as a percent)	5.30%	3.70%
Target allocations by asset class (as a percent)	5.00%
Diversified Investment, Funds
Change in plan assets:
Total plan assets invested in active corporate bond funds (as a percent)	1.30%	2.00%
Other Insurance Product Line
Change in plan assets:
Total plan assets invested in active corporate bond funds (as a percent)	2.20%	1.50%
Target allocations by asset class (as a percent)	2.00%
Cash and Cash Equivalents
Change in plan assets:
Total plan assets invested in active corporate bond funds (as a percent)	0.30%	0.40%