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Employee Benefit Plans US Pension Assets, Fair Value Measurement by Input Level (Details) - UNITED STATES - Pension Plan - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets $ 1,710.9 $ 1,600.0 $ 1,454.9
U.S. Large Cap      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 112.6 95.2  
U.S. Large Cap | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
U.S. Large Cap | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
U.S. Large Cap | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
U.S. Large Cap | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 112.6 95.2  
U.S. Small Cap      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 59.0 47.8  
U.S. Small Cap | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 25.8 23.0  
U.S. Small Cap | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
U.S. Small Cap | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
U.S. Small Cap | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 33.2 24.8  
Global      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 307.9 299.1  
Global | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
Global | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
Global | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
Global | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 307.9 299.1  
International      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 31.6 28.3  
International | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
International | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
International | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
International | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 31.6 28.3  
Emerging Markets      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 62.3 50.4  
Emerging Markets | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
Emerging Markets | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
Emerging Markets | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
Emerging Markets | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 62.3 50.4  
U.S. Government and Agencies      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 227.8 199.0  
U.S. Government and Agencies | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 227.8 199.0  
U.S. Government and Agencies | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
U.S. Government and Agencies | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
U.S. Government and Agencies | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
Corporate      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 445.6 391.1  
Corporate | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
Corporate | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 445.6 391.1  
Corporate | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
Corporate | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
State and Municipal Securities      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 3.7 2.5  
State and Municipal Securities | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
State and Municipal Securities | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 3.7 2.5  
State and Municipal Securities | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
State and Municipal Securities | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
Opportunistic Credits      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 200.4 196.5  
Opportunistic Credits | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
Opportunistic Credits | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
Opportunistic Credits | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
Opportunistic Credits | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 200.4 196.5  
Real Estate      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 108.9 108.4  
Real Estate | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
Real Estate | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
Real Estate | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
Real Estate | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 108.9 108.4  
Private Equity Direct Investments      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 62.1 57.7  
Private Equity Direct Investments | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
Private Equity Direct Investments | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
Private Equity Direct Investments | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
Private Equity Direct Investments | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 62.1 57.7  
Private Equity Funds of Funds      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 39.2 38.4  
Private Equity Funds of Funds | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
Private Equity Funds of Funds | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
Private Equity Funds of Funds | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
Private Equity Funds of Funds | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 39.2 38.4  
Cash Equivalents      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 46.3 82.4  
Cash Equivalents | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 46.3 82.4  
Cash Equivalents | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
Cash Equivalents | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
Cash Equivalents | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
Total Invested Assets      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 1,707.4 1,596.8  
Total Invested Assets | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 299.9 304.4  
Total Invested Assets | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 449.3 393.6  
Total Invested Assets | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets 0.0 0.0  
Total Invested Assets | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure      
Fair Value of Plan Assets $ 958.2 $ 898.8