Employee Benefits - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Benefits Disclosure [Line Items]
Severance Costs	$ 1.8	$ 3.5	$ 4.8
Projected benefit obligation, period increase	96.4
Actuarial gains losses amortization percentage	10.00%
Contribution to pension plans	81.1	26.2
Expected pension contributions minimum funding requirements	7.7
Annual benefits expected to be paid year one	72.7
Annual benefits expected to be paid year two	76.6
Annual benefits expected to be paid year three	84.0
Annual benefits expected to be paid year four	88.6
Annual benefits expected to be paid year five	94.3
Annual benefits expected to be paid for the five years thereafter	555.8
Unrecognized actuarial loss amount in accumulated other comprehensive loss expected to be amortized next year	40.8
Unrecognized prior service cost amount in accumulated other comprehensive loss expected to be amortized next year	1.3
Accumulated benefit obligation for all pension plans of the Company	2,113.7	1,742.2
Metal and Electrical Engineering Industry Pension Fund
Employee Benefits Disclosure [Line Items]
Actual coverage ratio percentage	104.10%
Defined Contribution Pension
Employee Benefits Disclosure [Line Items]
Percentage match for base wages	5.00%	5.00%	5.00%
Defined contribution benefit plans expense	36.3	34.0	33.6
Minimum
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%
Minimum | Western Metal Industry Pension Plan
Employee Benefits Disclosure [Line Items]
Contributions by the Company	5.00%
Maximum
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 | Western Metal Industry Pension Plan
Employee Benefits Disclosure [Line Items]
Contributions by the Company	12.00%