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Pension and Other Postretirement Benefit Plans - Additional Information (Detail) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 USD ($) pension_plan agreement | Dec. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) pension_plan agreement age | Dec. 31, 2018 USD ($) | Dec. 31, 2017 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) |  |  | $ (13.7) | $ 3.0 | $ 1.5
Other (income) expense, net |  |  | 24.6 | 31.6 | (4.1)
Cost of sales |  |  | (18,072.8) | (18,830.2) | (18,175.9)
Selling, general and administrative expenses |  |  | $ (605.0) | (612.8) | (635.2)
Number of multi-employer pension plans | pension_plan | 2 |  | 2 |  |
Number of collective bargaining agreements | agreement | 4 |  | 4 |  |
Defined contribution retirement program |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined contribution expense |  |  | $ 17.6 | $ 21.5 | 21.3
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 |  | 1 |  |
July 3, 2020 |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Number of collective bargaining agreements | agreement | 2 |  | 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
Foreign |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Curtailment gain (loss) | $ 12.9 |  |  |  |
Defined contribution expense |  |  | $ 14.0 | $ 13.7 | 15.0
Pension |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accumulated benefit obligation | 990.3 | $ 864.1 | $ 990.3 | 864.1 |
Pension | Minimum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Period for amortizing actuarial losses |  |  | 5 years |  |
Estimated required contributions to pension plans in next fiscal year | 15.0 |  | $ 15.0 |  |
Pension | Maximum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Period for amortizing actuarial losses |  |  | 36 years |  |
Estimated required contributions to pension plans in next fiscal year | $ 20.0 |  | $ 20.0 |  |
Pension | U.S. |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlement payments |  |  | 0.0 | 73.2 |
Settlement charge |  | $ (5.4) |  | 5.4 | 1.7
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% |  | 45.00% |  |
Pension | U.S. | Minimum | Risk mitigating assets |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target percentage of asset allocation | 35.00% |  | 35.00% |  |
Pension | U.S. | Maximum | Return seeking assets |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target percentage of asset allocation | 65.00% |  | 65.00% |  |
Pension | U.S. | Maximum | Risk mitigating assets |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target percentage of asset allocation | 55.00% |  | 55.00% |  |
Pension | Foreign |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlement payments |  |  | $ 0.0 | 0.0 |
Curtailment gain (loss) |  |  | $ 2.3 | (0.4) | (0.9)
Pension | Foreign | Minimum | Equity securities |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target percentage of asset allocation | 45.00% |  | 45.00% |  |
Pension | Foreign | Minimum | Fixed income |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target percentage of asset allocation | 25.00% |  | 25.00% |  |
Pension | Foreign | Minimum | Alternative investments |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target percentage of asset allocation | 0.00% |  | 0.00% |  |
Pension | Foreign | Minimum | Cash and other |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target percentage of asset allocation | 0.00% |  | 0.00% |  |
Pension | Foreign | Maximum | Equity securities |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target percentage of asset allocation | 65.00% |  | 65.00% |  |
Pension | Foreign | Maximum | Fixed income |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target percentage of asset allocation | 45.00% |  | 45.00% |  |
Pension | Foreign | Maximum | Alternative investments |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target percentage of asset allocation | 25.00% |  | 25.00% |  |
Pension | Foreign | Maximum | Cash and other |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target percentage of asset allocation | 15.00% |  | 15.00% |  |
Other Postretirement | Minimum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Period for amortizing actuarial losses |  |  | 2 years |  |
Other Postretirement | Maximum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Period for amortizing actuarial losses |  |  | 18 years |  |
Other Postretirement | U.S. |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlement payments |  |  | $ 0.0 | 0.0 |
Curtailment gain (loss) |  |  | 0.0 | 0.0 | 0.0
Other Postretirement | Foreign |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlement payments |  |  | 0.0 | 0.0 |
Curtailment gain (loss) |  |  | 10.6 | $ 0.0 | $ 0.0
Other Postretirement | Foreign | Pension benefit plan curtailment gain |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Curtailment gain (loss) |  |  | $ 10.6 |  |

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