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Summary of Significant Accounting Policies Materials, Supplies, and Inventories (Details) $ in Millions | Dec. 31, 2021 USD ($) $ / MMBTU | Dec. 31, 2020 USD ($) $ / MMBTU
--- | --- | ---
Inventory |  |
Natural gas in storage | $ 326.0 | $ 224.9
Materials and supplies | 225.3 | 218.1
Fossil fuel | 84.5 | 85.6
Total | $ 635.8 | $ 528.6
Percentage of LIFO inventory | 19.00% | 22.00%
PGL and NSG |  |
Inventory |  |
Excess of replacement or current costs over stated LIFO value | $ 114.2 | $ 31.5
Natural gas price benchmark | $ / MMBTU | 3.67 | 2.31

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