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Pension and Other Postretirement Benefit Plans - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) agreement pension_plan age | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Services completed by employees for eligibility, retiring age | age | 55 |  |
Tax expense related to defined benefit plans recognized in other comprehensive income (loss) | $ 3.0 | $ 1.5 | $ 7.1
Other (income) expense, net | 31.6 | (4.1) | 40.6
Cost of sales | (18,830.2) | (18,175.9) | (16,435.0)
Selling, general and administrative expenses | $ (612.8) | (635.2) | (608.2)
Number of multi-employer pension plans | pension_plan | 2 |  |
Number of collective bargaining agreements | agreement | 3 |  |
Defined contribution retirement program |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution expense | $ 21.5 | $ 21.3 | 21.2
Unionized employees | Multi-employer plan total contributions |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Concentration risk percentage (more than) | 5.00% | 5.00% |
April 24, 2020 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of collective bargaining agreements | agreement | 1 |  |
July 3, 2020 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of collective bargaining agreements | agreement | 2 |  |
ASU 2017-07 | Restatement Adjustment |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Other (income) expense, net |  |  | 34.2
Cost of sales |  |  | 20.5
Selling, general and administrative expenses |  |  | 13.7
Pension benefit plan curtailment and settlement losses |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Curtailment gain (loss) |  | $ (1.7) |
Foreign |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution expense | $ 13.7 | 15.0 | 14.4
Pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation | $ 864.1 | 1,034.7 |
Pension | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Period for amortizing actuarial losses | 5 years |  |
Estimated minimum required contributions to pension plans in next fiscal year | $ 10.0 |  |
Pension | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Period for amortizing actuarial losses | 28 years |  |
Estimated minimum required contributions to pension plans in next fiscal year | $ 15.0 |  |
Pension | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Settlement payments | 73.2 | 0.0 |
Settlement charge | 5.4 |  | 34.2
Curtailment gain (loss) | $ 0.0 | 0.0 | 0.0
Pension | U.S. | Minimum | Return seeking assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target percentage of asset allocation | 45.00% |  |
Pension | U.S. | Minimum | Risk mitigating assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target percentage of asset allocation | 35.00% |  |
Pension | U.S. | Maximum | Return seeking assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target percentage of asset allocation | 65.00% |  |
Pension | U.S. | Maximum | Risk mitigating assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target percentage of asset allocation | 55.00% |  |
Pension | Foreign |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Settlement payments | $ 0.0 | 0.0 |
Curtailment gain (loss) | $ (0.4) | (0.9) | $ 0.0
Pension | Foreign | Minimum | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target percentage of asset allocation | 45.00% |  |
Pension | Foreign | Minimum | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target percentage of asset allocation | 25.00% |  |
Pension | Foreign | Minimum | Alternative investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target percentage of asset allocation | 0.00% |  |
Pension | Foreign | Minimum | Cash and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target percentage of asset allocation | 0.00% |  |
Pension | Foreign | Maximum | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target percentage of asset allocation | 65.00% |  |
Pension | Foreign | Maximum | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target percentage of asset allocation | 45.00% |  |
Pension | Foreign | Maximum | Alternative investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target percentage of asset allocation | 25.00% |  |
Pension | Foreign | Maximum | Cash and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target percentage of asset allocation | 15.00% |  |
Other Postretirement | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Period for amortizing actuarial losses | 3 years |  |
Other Postretirement | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Period for amortizing actuarial losses | 16 years |  |
Other Postretirement | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Settlement payments | $ 0.0 | 0.0 |
Other Postretirement | Foreign |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Settlement payments | $ 0.0 | $ 0.0 |

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