Employee Benefits - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Employee Benefits Disclosure [Line Items]
Severance Costs	$ 3.3	$ 1.8	$ 3.5
Defined Benefit Pension Plans
Employee Benefits Disclosure [Line Items]
Accumulated unrecognized actuarial gains and losses	10.00%
Contribution to pension plans	$ 62.9	81.1
Expected pension contributions minimum funding requirements	18.4
Annual benefits expected to be paid year one	78.9
Annual benefits expected to be paid year two	81.3
Annual benefits expected to be paid year three	86.7
Annual benefits expected to be paid year four	90.6
Annual benefits expected to be paid year five	97.3
Annual benefits expected to be paid for the five years thereafter	571.5
Retirement plan, total lump-sum distribution	48.5
Unrecognized actuarial loss amount in accumulated other comprehensive loss expected to be amortized next year	26.3
Unrecognized prior service cost amount in accumulated other comprehensive loss expected to be amortized next year	1.2
Accumulated benefit obligation for all pension plans of the Company	$ 2,028.2	$ 2,113.7
Metal and Electrical Engineering Industry Pension Fund
Employee Benefits Disclosure [Line Items]
Actual coverage ratio percentage	97.70%
Western Metal Industry Pension Plan
Employee Benefits Disclosure [Line Items]
Contributions by the Company	12.00%	12.00%
Defined Contribution Plans
Employee Benefits Disclosure [Line Items]
Percentage match for base wages	5.00%	5.00%	5.00%
Defined contribution benefit plans expense	$ 36.1	$ 36.3	$ 34.0
Minimum | Defined Benefit Pension Plans
Employee Benefits Disclosure [Line Items]
Expected pension contributions by the company to the pension plans in the next year	$ 50.0
Minimum | Metal and Electrical Engineering Industry Pension Fund
Employee Benefits Disclosure [Line Items]
Required coverage ratio percentage	104.30%
Maximum | Defined Benefit Pension Plans
Employee Benefits Disclosure [Line Items]
Expected pension contributions by the company to the pension plans in the next year	$ 100.0
Maximum | Metal and Electrical Engineering Industry Pension Fund
Employee Benefits Disclosure [Line Items]
Contributions by the Company	5.00%	5.00%
Maximum | Other Plans
Employee Benefits Disclosure [Line Items]
Contributions by the Company	5.00%