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Employee Benefits - Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 2,628.0 $ 3,328.9 $ 3,225.0
Pension Plan | Level 1, 2, and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 1,367.4 1,918.0  
Pension Plan | Level 1, 2, and 3 | United States equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 231.5 417.1  
Pension Plan | Level 1, 2, and 3 | International equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 202.2 313.7  
Pension Plan | Level 1, 2, and 3 | United States bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 838.7 1,068.7  
Pension Plan | Level 1, 2, and 3 | International bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 95.0 118.5  
Pension Plan | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 433.7 730.8  
Pension Plan | Level 1 | United States equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 231.5 417.1  
Pension Plan | Level 1 | International equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 202.2 313.7  
Pension Plan | Level 1 | United States bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
Pension Plan | Level 1 | International bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
Pension Plan | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 933.7 1,187.2  
Pension Plan | Level 2 | United States equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
Pension Plan | Level 2 | International equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
Pension Plan | Level 2 | United States bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 838.7 1,068.7  
Pension Plan | Level 2 | International bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 95.0 118.5  
Pension Plan | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
Pension Plan | Level 3 | United States equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
Pension Plan | Level 3 | International equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
Pension Plan | Level 3 | United States bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
Pension Plan | Level 3 | International bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
Pension Plan | Investments measured at net asset value per share | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 466.0 659.2  
Pension Plan | Investments measured at net asset value per share | Fixed income securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 101.0 127.7  
Pension Plan | Investments measured at net asset value per share | Other investments      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 693.6 624.0  
OPEB Plan      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 835.3 1,000.2 $ 951.4
OPEB Plan | Level 1, 2, and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 464.7 617.4  
OPEB Plan | Level 1, 2, and 3 | United States equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 92.5 135.4  
OPEB Plan | Level 1, 2, and 3 | International equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 83.9 109.1  
OPEB Plan | Level 1, 2, and 3 | United States bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 275.1 357.3  
OPEB Plan | Level 1, 2, and 3 | International bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 13.2 15.6  
OPEB Plan | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 306.2 409.5  
OPEB Plan | Level 1 | United States equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 92.5 135.4  
OPEB Plan | Level 1 | International equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 83.9 109.1  
OPEB Plan | Level 1 | United States bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 129.8 165.0  
OPEB Plan | Level 1 | International bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
OPEB Plan | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 158.5 207.9  
OPEB Plan | Level 2 | United States equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
OPEB Plan | Level 2 | International equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
OPEB Plan | Level 2 | United States bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 145.3 192.3  
OPEB Plan | Level 2 | International bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 13.2 15.6  
OPEB Plan | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
OPEB Plan | Level 3 | United States equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
OPEB Plan | Level 3 | International equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
OPEB Plan | Level 3 | United States bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
OPEB Plan | Level 3 | International bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
OPEB Plan | Investments measured at net asset value per share | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 186.6 224.5  
OPEB Plan | Investments measured at net asset value per share | Fixed income securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 65.5 112.3  
OPEB Plan | Investments measured at net asset value per share | Other investments      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 118.5 $ 46.0