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Postretirement Benefit Plans - Fair Value of Plan Assets Held by Our Postretirement Benefits Plans (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | $ 321.8 | $ 281.3 | $ 326.7
Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 320.5 | 278.4 |
Pension Plan [Member] | U.S. equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset |  | 49.4 |
Pension Plan [Member] | International equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset |  | 25.1 |
Pension Plan [Member] | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 238.8 | 201.8 |
Pension Plan [Member] | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 0.0 | 0.0 |
Pension Plan [Member] | Cash and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 81.7 | 2.1 |
Pension Plan [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 81.7 | 2.1 |
Pension Plan [Member] | Level 1 [Member] | U.S. equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset |  | 0.0 |
Pension Plan [Member] | Level 1 [Member] | International equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset |  | 0.0 |
Pension Plan [Member] | Level 1 [Member] | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 0.0 | 0.0 |
Pension Plan [Member] | Level 1 [Member] | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 0.0 | 0.0 |
Pension Plan [Member] | Level 1 [Member] | Cash and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 81.7 | 2.1 |
Pension Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 238.8 | 276.3 |
Pension Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | U.S. equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset |  | 49.4 |
Pension Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | International equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset |  | 25.1 |
Pension Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 238.8 | 201.8 |
Pension Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 0.0 | 0.0 |
Pension Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Cash and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 0.0 | 0.0 |
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 1.3 | 2.9 | $ 5.2
Other Postretirement Benefits Plan [Member] | U.S. equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset |  | 0.0 |
Other Postretirement Benefits Plan [Member] | International equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset |  | 0.0 |
Other Postretirement Benefits Plan [Member] | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 0.0 | 0.0 |
Other Postretirement Benefits Plan [Member] | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 1.3 | 2.9 |
Other Postretirement Benefits Plan [Member] | Cash and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 0.0 | 0.0 |
Other Postretirement Benefits Plan [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 1.3 | 2.9 |
Other Postretirement Benefits Plan [Member] | Level 1 [Member] | U.S. equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset |  | 0.0 |
Other Postretirement Benefits Plan [Member] | Level 1 [Member] | International equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset |  | 0.0 |
Other Postretirement Benefits Plan [Member] | Level 1 [Member] | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 0.0 | 0.0 |
Other Postretirement Benefits Plan [Member] | Level 1 [Member] | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 1.3 | 2.9 |
Other Postretirement Benefits Plan [Member] | Level 1 [Member] | Cash and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | $ 0.0 | $ 0.0 |

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