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Benefit Plans Benefit Plans - Allocation of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Private equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments $ 2.4 $ 2.4  
U.S. Plans | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Target 100.00%    
Actual 100.00% 100.00%  
Fair value of plan assets $ 486.4 $ 427.8 $ 346.0
U.S. Plans | Pension Benefits | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 92.7 78.0  
U.S. Plans | Pension Benefits | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 350.0 305.5  
U.S. Plans | Pension Benefits | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 43.7 44.3  
U.S. Plans | Pension Benefits | Cash and short-term investments      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 16.4 6.5  
U.S. Plans | Pension Benefits | Cash and short-term investments | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 16.4 6.5  
U.S. Plans | Pension Benefits | Cash and short-term investments | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Cash and short-term investments | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Mutual funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.8  
U.S. Plans | Pension Benefits | Mutual funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.8  
U.S. Plans | Pension Benefits | Mutual funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Mutual funds | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | U.S. mid cap value | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | U.S. mid cap value | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | U.S. mid cap value | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | U.S. small cap core      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 23.6 23.4  
U.S. Plans | Pension Benefits | U.S. small cap core | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 23.6 23.4  
U.S. Plans | Pension Benefits | U.S. small cap core | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | U.S. small cap core | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | U.S. corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 61.8 50.8  
U.S. Plans | Pension Benefits | U.S. corporate bonds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | U.S. corporate bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 61.8 50.8  
U.S. Plans | Pension Benefits | U.S. corporate bonds | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | International corporate bonds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | International corporate bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | International corporate bonds | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | U.S. government      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5.5 11.6  
U.S. Plans | Pension Benefits | U.S. government | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | U.S. government | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5.5 11.6  
U.S. Plans | Pension Benefits | U.S. government | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Fixed and index funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1.9 1.8  
U.S. Plans | Pension Benefits | Fixed and index funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Fixed and index funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1.9 1.8  
U.S. Plans | Pension Benefits | Fixed and index funds | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 18.0 17.6  
U.S. Plans | Pension Benefits | Real estate | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Real estate | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Real estate | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 18.0 17.6  
U.S. Plans | Pension Benefits | Other common collective trusts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 280.8 241.3  
U.S. Plans | Pension Benefits | Other common collective trusts | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Other common collective trusts | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 280.8 241.3  
U.S. Plans | Pension Benefits | Other common collective trusts | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Multi-strategy hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 21.4 20.4  
U.S. Plans | Pension Benefits | Multi-strategy hedge funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Multi-strategy hedge funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Multi-strategy hedge funds | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 21.4 20.4  
U.S. Plans | Pension Benefits | Private equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4.3 6.3  
U.S. Plans | Pension Benefits | Private equity funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Private equity funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Private equity funds | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4.3 6.3  
U.S. Plans | Pension Benefits | Other Alternative Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Other Alternative Investments [Member] | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Other Alternative Investments [Member] | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Other Alternative Investments [Member] | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | International developed markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 52.7 47.3  
U.S. Plans | Pension Benefits | International developed markets | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 52.7 47.3  
U.S. Plans | Pension Benefits | International developed markets | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | International developed markets | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0.0 0.0  
U.S. Plans | Pension Benefits | Emerging markets | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.0  
U.S. Plans | Pension Benefits | Emerging markets | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.0  
U.S. Plans | Pension Benefits | Emerging markets | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   $ 0.0  
U.S. Plans | Real estate | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Target 5.00%    
Actual 4.00% 4.00%  
U.S. Plans | Equity securities | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Target 45.00%    
Actual 50.00% 48.00%  
U.S. Plans | Debt securities | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Target 40.00%    
Actual 37.00% 40.00%  
U.S. Plans | Other | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Target 10.00%    
Actual 9.00% 8.00%  
Foreign Plan [Member] | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Target 100.00%    
Actual 100.00% 100.00%  
Fair value of plan assets $ 394.1 $ 359.6 $ 340.9
Foreign Plan [Member] | Pension Benefits | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 218.0 201.8  
Foreign Plan [Member] | Pension Benefits | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 93.3 87.2  
Foreign Plan [Member] | Pension Benefits | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 82.8 70.6  
Foreign Plan [Member] | Pension Benefits | Cash and short-term investments      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 20.9 28.4  
Foreign Plan [Member] | Pension Benefits | Cash and short-term investments | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 20.1 28.4  
Foreign Plan [Member] | Pension Benefits | Cash and short-term investments | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.8 0.0  
Foreign Plan [Member] | Pension Benefits | Cash and short-term investments | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Mutual funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Foreign Plan [Member] | Pension Benefits | Mutual funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Mutual funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Mutual funds | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | U.S. mid cap value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.9  
Foreign Plan [Member] | Pension Benefits | U.S. mid cap value | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.9  
Foreign Plan [Member] | Pension Benefits | U.S. mid cap value | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | U.S. mid cap value | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | U.S. small cap core      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 9.3    
Foreign Plan [Member] | Pension Benefits | U.S. small cap core | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 9.3 0.0  
Foreign Plan [Member] | Pension Benefits | U.S. small cap core | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | U.S. small cap core | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | U.S. corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7.8    
Foreign Plan [Member] | Pension Benefits | U.S. corporate bonds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | U.S. corporate bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7.8 0.0  
Foreign Plan [Member] | Pension Benefits | U.S. corporate bonds | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | International corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 67.5 62.5  
Foreign Plan [Member] | Pension Benefits | International corporate bonds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | International corporate bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 67.5 62.5  
Foreign Plan [Member] | Pension Benefits | International corporate bonds | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | U.S. government      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 10.9 3.8  
Foreign Plan [Member] | Pension Benefits | U.S. government | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | U.S. government | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 10.9 3.8  
Foreign Plan [Member] | Pension Benefits | U.S. government | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Fixed and index funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   15.9  
Foreign Plan [Member] | Pension Benefits | Fixed and index funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Fixed and index funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 15.9  
Foreign Plan [Member] | Pension Benefits | Fixed and index funds | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 6.3 5.0  
Foreign Plan [Member] | Pension Benefits | Real estate | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Real estate | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 6.3 5.0  
Foreign Plan [Member] | Pension Benefits | Real estate | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Other common collective trusts | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Other common collective trusts | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Other common collective trusts | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Multi-strategy hedge funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Multi-strategy hedge funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Multi-strategy hedge funds | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Private equity funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Private equity funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Private equity funds | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Other Alternative Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 82.8 70.6  
Foreign Plan [Member] | Pension Benefits | Other Alternative Investments [Member] | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Other Alternative Investments [Member] | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Other Alternative Investments [Member] | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 82.8 70.6  
Foreign Plan [Member] | Pension Benefits | International developed markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 188.6 172.5  
Foreign Plan [Member] | Pension Benefits | International developed markets | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 188.6 172.5  
Foreign Plan [Member] | Pension Benefits | International developed markets | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | International developed markets | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Emerging markets | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.0  
Foreign Plan [Member] | Pension Benefits | Emerging markets | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.0  
Foreign Plan [Member] | Pension Benefits | Emerging markets | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   $ 0.0  
Foreign Plan [Member] | Real estate | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Target 10.00%    
Actual 10.00% 10.00%  
Foreign Plan [Member] | Equity securities | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Target 51.00%    
Actual 50.00% 48.00%  
Foreign Plan [Member] | Debt securities | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Target 22.00%    
Actual 22.00% 23.00%  
Foreign Plan [Member] | Other | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Target 17.00%    
Actual 18.00% 19.00%  
Office [Member] | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Actual 36.00% 37.00%  
Industrial, Cash and Other [Member] | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Actual 21.00% 18.00%  
Long Short Equity [Member] | Multi-strategy hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
Actual 40.00% 41.00%  
Arbitrage and Event Investments [Member] | Multi-strategy hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
Actual 26.00% 34.00%  
Directional Trading, Fixed Income and Other Investments [Member] | Multi-strategy hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
Actual 34.00% 25.00%  
S&P Mid Cap 400 Index Funds [Member] | Other common collective trusts      
Defined Benefit Plan Disclosure [Line Items]      
Actual 16.00% 15.00%  
Emerging markets | Other common collective trusts      
Defined Benefit Plan Disclosure [Line Items]      
Actual 10.00% 10.00%  
Russell 1000 Fund Large Cap Index Funds [Member] | Other common collective trusts      
Defined Benefit Plan Disclosure [Line Items]      
Actual 33.00% 31.00%  
Buyout Private Equity Funds [Member] | Private equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Actual 46.00% 44.00%  
Special Situation Private Equity and Debt Funds [Member] | Private equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Actual 26.00% 32.00%  
Venture Private Equity Funds [Member] | Private equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Actual 28.00% 24.00%  
Residential [Member] | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Actual 22.00% 21.00%  
Corporate Debt Securities [Member] | Other common collective trusts      
Defined Benefit Plan Disclosure [Line Items]      
Actual 55.00% 46.00%  
Collateralized Mortgage Backed Securities [Member] | Other common collective trusts      
Defined Benefit Plan Disclosure [Line Items]      
Actual 25.00% 24.00%