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Other Retirement Plans (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) employee | Sep. 30, 2020 USD ($) employee | Sep. 30, 2021 USD ($) employee | Sep. 30, 2020 USD ($) employee
Covered Employees and Contributions, Multiemployer Plans [Line Items] |  |  |  |
Multiemployer plan, employer contribution, cost | $ 48.6 | $ 8.9 | $ 103.0 | $ 25.0
Pension |  |  |  |
Covered Employees and Contributions, Multiemployer Plans [Line Items] |  |  |  |
Multiemployer plan, employer contribution, cost | 36.9 | 7.2 | 81.1 | 19.5
Other Multiemployer |  |  |  |
Covered Employees and Contributions, Multiemployer Plans [Line Items] |  |  |  |
Multiemployer plan, employer contribution, cost | $ 11.7 | $ 1.7 | $ 21.9 | $ 5.5
Low |  |  |  |
Covered Employees and Contributions, Multiemployer Plans [Line Items] |  |  |  |
Multiemployer plans, covered employees (in number of employees) | employee | 5,116 | 1,452 | 2,412 | 1,119
High |  |  |  |
Covered Employees and Contributions, Multiemployer Plans [Line Items] |  |  |  |
Multiemployer plans, covered employees (in number of employees) | employee | 6,979 | 1,469 | 6,979 | 1,469

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