Retirement Benefit Plans (Actual Allocation Percentage and Target Allocation Percentage for the U.S. Pension Plan Assets) (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
U.S. Pension Plan | U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Actual allocation	45.80%	52.10%
Target allocations range, minimum	36.00%
Target allocations range, maximum	54.00%
U.S. Pension Plan | Non-U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Actual allocation	19.70%	12.30%
Target allocations range, minimum	16.00%
Target allocations range, maximum	24.00%
U.S. Pension Plan | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Actual allocation	33.70%	35.10%
Target allocations range, minimum	30.00%
Target allocations range, maximum	40.00%
U.S. Pension Plan | Money market
Defined Benefit Plan Disclosure [Line Items]
Actual allocation	0.80%	0.50%
Target allocations range, minimum	0.00%
Target allocations range, maximum	10.00%
Non-U.S. Pension Plan | Canadian equity securities
Defined Benefit Plan Disclosure [Line Items]
Actual allocation	32.70%	28.90%
Target allocations range, minimum	25.00%
Target allocations range, maximum	35.00%
Non-U.S. Pension Plan | Non-Canadian equity securities
Defined Benefit Plan Disclosure [Line Items]
Actual allocation	32.10%	30.60%
Target allocations range, minimum	25.00%
Target allocations range, maximum	35.00%
Non-U.S. Pension Plan | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Actual allocation	35.20%	40.50%
Target allocations range, minimum	30.00%
Target allocations range, maximum	50.00%
Non-U.S. Pension Plan | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Actual allocation	0.00%	0.00%
Target allocations range, minimum	0.00%
Target allocations range, maximum	5.00%