Retirement Benefits - Pension Plan Weighted Average Asset Allocations (Details)	Dec. 31, 2016	Dec. 31, 2015
U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan securities	100.00%	100.00%
U.S. Plans | Equity Securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan securities	44.00%	49.00%
U.S. Plans | Fixed Income Securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan securities	43.00%	49.00%
U.S. Plans | Cash/Commingled Funds/Other
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan securities	13.00%	2.00%
Non-U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan securities	100.00%	100.00%
Non-U.S. Plans | Equity Securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan securities	24.00%	36.00%
Non-U.S. Plans | Fixed Income Securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan securities	26.00%	44.00%
Non-U.S. Plans | Cash/Commingled Funds/Other
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan securities	50.00%	20.00%