Employee Benefits - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Severance Costs	$ 5.8	$ 0.7	$ 0.8
Metal and Electrical Engineering Industry Pension Fund
Defined Benefit Plan Disclosure [Line Items]
Actual coverage ratio percentage	96.90%
Western Metal Industry Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Contributions by the Company	20.00%	14.00%
Minimum | Metal and Electrical Engineering Industry Pension Fund
Defined Benefit Plan Disclosure [Line Items]
Required coverage ratio percentage	104.30%
Maximum | Metal and Electrical Engineering Industry Pension Fund
Defined Benefit Plan Disclosure [Line Items]
Contributions by the Company	5.00%	5.00%
Maximum | Other Plans
Defined Benefit Plan Disclosure [Line Items]
Contributions by the Company	5.00%	5.00%
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Accumulated unrecognized actuarial gains and losses	10.00%
Contribution to pension plans	$ 35.7	$ 88.9
Expected pension contributions minimum funding requirements	21.4
Annual benefits expected to be paid year one	133.2
Annual benefits expected to be paid year two	103.0
Annual benefits expected to be paid year three	109.1
Annual benefits expected to be paid year four	113.6
Annual benefits expected to be paid year five	120.5
Annual benefits expected to be paid for the five years thereafter	683.5
Unrecognized actuarial loss amount in accumulated other comprehensive loss expected to be amortized next year	41.7
Unrecognized prior service cost amount in accumulated other comprehensive loss expected to be amortized next year	1.5
Accumulated benefit obligation for all pension plans of the Company	2,806.3	$ 2,356.2
Defined Benefit Pension Plans | Minimum
Defined Benefit Plan Disclosure [Line Items]
Expected pension contributions by the company to the pension plans in the next year	80.0
Defined Benefit Pension Plans | Maximum
Defined Benefit Plan Disclosure [Line Items]
Expected pension contributions by the company to the pension plans in the next year	$ 120.0
Defined Contribution Plans
Defined Benefit Plan Disclosure [Line Items]
Percentage match for base wages	5.00%	5.00%	5.00%
Defined contribution benefit plans expense	$ 48.3	$ 45.3	$ 37.9