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Pension Plans and Other Postretirement Benefits - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution plan, employer contributions | $ 520.0 | $ 550.0 | $ 334.0
Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | 25.0 | 25.0 | 12.0
Multiemployer plans, plan contributions | 19.0 | 18.0 | 18.0
Benefit obligation | 6,462.0 | 6,239.0 | 5,841.0
Net periodic benefit cost | $ (218.0) | (131.0) | (6.0)
Pension Plan | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target investment allocations | 20.00% |  |
Pension Plan | Debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target investment allocations | 68.00% |  |
Pension Plan | Real Estate Investment |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target investment allocations | 6.00% |  |
Pension Plan | Private equity investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target investment allocations | 3.00% |  |
Pension Plan | Hedge Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target investment allocations | 3.00% |  |
Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Multiemployer plans, plan contributions | $ 54.0 | 57.0 | 58.0
Benefit obligation | 226.0 | 246.0 |
Net periodic benefit cost | $ 12.0 | $ 7.0 | $ 2.0

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