Retirement Plans (Details 9)	12 Months Ended
Dec. 31, 2014
U. S. Pension Plans And U. S. Retiree Healthcare Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan investment goals	The asset allocation policy for the U.S. Pension Plans and U.S. retiree healthcare plan was developed in consideration of the following long-term investment objectives: achieving a return on assets consistent with the investment policy, achieving portfolio returns which exceed the average return for similarly invested funds and maximizing portfolio returns with at least a return of 2.5% above the one-year constant maturity Treasury bond yield over reasonable measurement periods and based on reasonable market cycles.
Defined benefit plan diversification	The Company targets a 20% allocation of its U.S. retirement plans’ equity portfolio to be invested in financial markets outside of the United States.
U. S. Pension Plans And U. S. Retiree Healthcare Plan [Member] \| Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocation in defined benefit plan	60.00%
U. S. Pension Plans And U. S. Retiree Healthcare Plan [Member] \| Equity Securities \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocation in defined benefit plan	40.00%
U. S. Pension Plans And U. S. Retiree Healthcare Plan [Member] \| Equity Securities \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocation in defined benefit plan	80.00%
U. S. Pension Plans And U. S. Retiree Healthcare Plan [Member] \| Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocation in defined benefit plan	25.00%
U. S. Pension Plans And U. S. Retiree Healthcare Plan [Member] \| Debt Securities [Member] \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocation in defined benefit plan	20.00%
U. S. Pension Plans And U. S. Retiree Healthcare Plan [Member] \| Debt Securities [Member] \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocation in defined benefit plan	60.00%
U. S. Pension Plans And U. S. Retiree Healthcare Plan [Member] \| Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocation in defined benefit plan	5.00%
U. S. Pension Plans And U. S. Retiree Healthcare Plan [Member] \| Cash and Cash Equivalents [Member] \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocation in defined benefit plan	0.00%
U. S. Pension Plans And U. S. Retiree Healthcare Plan [Member] \| Cash and Cash Equivalents [Member] \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocation in defined benefit plan	20.00%
U. S. Pension Plans And U. S. Retiree Healthcare Plan [Member] \| Insurance Contracts and Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocation in defined benefit plan	10.00%
U. S. Pension Plans And U. S. Retiree Healthcare Plan [Member] \| Insurance Contracts and Other [Member] \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocation in defined benefit plan	0.00%
U. S. Pension Plans And U. S. Retiree Healthcare Plan [Member] \| Insurance Contracts and Other [Member] \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocation in defined benefit plan	20.00%
Non-U.S. Pension Plans \| Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocation in defined benefit plan	5.00%
Non-U.S. Pension Plans \| Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocation in defined benefit plan	10.00%
Non-U.S. Pension Plans \| Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocation in defined benefit plan	20.00%
Non-U.S. Pension Plans \| Insurance Contracts and Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocation in defined benefit plan	65.00%

Retirement Plans (Details 9)

12 Months Ended

Dec. 31, 2014

U. S. Pension Plans And U. S. Retiree Healthcare Plan [Member]

Defined Benefit Plan Disclosure [Line Items]

The asset allocation policy for the U.S. Pension Plans and U.S. retiree healthcare plan was developed in consideration of the following long-term investment objectives: achieving a return on assets consistent with the investment policy, achieving portfolio returns which exceed the average return for similarly invested funds and maximizing portfolio returns with at least a return of 2.5% above the one-year constant maturity Treasury bond yield over reasonable measurement periods and based on reasonable market cycles.

Defined benefit plan diversification

The Company targets a 20% allocation of its U.S. retirement plans’ equity portfolio to be invested in financial markets outside of the United States.