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Benefit Plans Benefit Plans - Allocation of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Private equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments $ 2.4 $ 5.5  
U.S. Plans | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Target 100.00%    
Actual 100.00% 100.00%  
Fair value of plan assets $ 427.8 $ 346.0 $ 378.7
U.S. Plans | Pension Benefits | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 78.0 81.5  
U.S. Plans | Pension Benefits | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 305.5 216.5  
U.S. Plans | Pension Benefits | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 44.3 48.0  
U.S. Plans | Pension Benefits | Cash and short-term investments      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 6.5 3.0  
U.S. Plans | Pension Benefits | Cash and short-term investments | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 6.5 3.0  
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 | Level 3      
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 26.8  
U.S. Plans | Pension Benefits | Mutual funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.8 26.8  
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 | Level 3      
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 | Level 3      
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 23.4 17.2  
U.S. Plans | Pension Benefits | U.S. small cap core | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 23.4 17.2  
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 | Level 3      
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 50.8 45.6  
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 50.8 45.6  
U.S. Plans | Pension Benefits | U.S. corporate bonds | Level 3      
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 | Level 3      
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 11.6 7.4  
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 11.6 7.4  
U.S. Plans | Pension Benefits | U.S. government | Level 3      
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 1.8 0.1  
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 1.8 0.1  
U.S. Plans | Pension Benefits | Fixed and index funds | Level 3      
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 17.6 20.8  
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 | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 17.6 20.8  
U.S. Plans | Pension Benefits | Other common collective trusts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 241.3 145.6  
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 241.3 145.6  
U.S. Plans | Pension Benefits | Other common collective trusts | Level 3      
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 20.4 19.3  
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 | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 20.4 19.3  
U.S. Plans | Pension Benefits | Private equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 6.3 7.9  
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 | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 6.3 7.9  
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] | Level 3      
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 47.3 34.5  
U.S. Plans | Pension Benefits | International developed markets | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 47.3 34.5  
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 | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0.0 0.0  
U.S. Plans | Pension Benefits | Emerging markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   17.8  
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   17.8  
U.S. Plans | Pension Benefits | Emerging markets | Level 3      
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% 6.00%  
U.S. Plans | Equity securities | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Target 45.00%    
Actual 48.00% 44.00%  
U.S. Plans | Debt securities | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Target 40.00%    
Actual 40.00% 41.00%  
U.S. Plans | Other | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Target 10.00%    
Actual 8.00% 9.00%  
Foreign Plan [Member] | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Target 100.00%    
Actual 100.00% 100.00%  
Fair value of plan assets $ 360.0 $ 340.9 $ 359.5
Foreign Plan [Member] | Pension Benefits | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 202.2 186.7  
Foreign Plan [Member] | Pension Benefits | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 87.2 82.4  
Foreign Plan [Member] | Pension Benefits | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 70.6 71.8  
Foreign Plan [Member] | Pension Benefits | Cash and short-term investments      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 28.8 34.0  
Foreign Plan [Member] | Pension Benefits | Cash and short-term investments | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 28.8 34.0  
Foreign Plan [Member] | Pension Benefits | Cash and short-term investments | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Cash and short-term investments | Level 3      
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 0.0 125.2  
Foreign Plan [Member] | Pension Benefits | Mutual funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 125.2  
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 | Level 3      
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 3.1  
Foreign Plan [Member] | Pension Benefits | U.S. mid cap value | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.9 3.1  
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 | Level 3      
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 0.0 0.3  
Foreign Plan [Member] | Pension Benefits | U.S. small cap core | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.3  
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 | Level 3      
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 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 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | U.S. corporate bonds | Level 3      
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 62.5 76.8  
Foreign Plan [Member] | Pension Benefits | International corporate bonds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 1.3  
Foreign Plan [Member] | Pension Benefits | International corporate bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 62.5 75.5  
Foreign Plan [Member] | Pension Benefits | International corporate bonds | Level 3      
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 3.8 0.0  
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 3.8 0.0  
Foreign Plan [Member] | Pension Benefits | U.S. government | Level 3      
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 14.7  
Foreign Plan [Member] | Pension Benefits | Fixed and index funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 14.7  
Foreign Plan [Member] | Pension Benefits | Fixed and index funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 15.9 0.0  
Foreign Plan [Member] | Pension Benefits | Fixed and index funds | Level 3      
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 5.0 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 5.0 5.0  
Foreign Plan [Member] | Pension Benefits | Real estate | Level 3      
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 | Level 3      
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 | Level 3      
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 | Level 3      
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 70.6 73.7  
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 1.9  
Foreign Plan [Member] | Pension Benefits | Other Alternative Investments [Member] | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 70.6 71.8  
Foreign Plan [Member] | Pension Benefits | International developed markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 172.5 7.7  
Foreign Plan [Member] | Pension Benefits | International developed markets | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 172.5 7.7  
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 | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Emerging markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.4  
Foreign Plan [Member] | Pension Benefits | Emerging markets | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.4  
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 | Level 3      
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 48.00%    
Actual 48.00% 40.00%  
Foreign Plan [Member] | Debt securities | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Target 23.00%    
Actual 23.00% 27.00%  
Foreign Plan [Member] | Other | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Target 19.00%    
Actual 19.00% 23.00%  
Office [Member] | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Actual 37.00% 37.00%  
Industrial, Cash and Other [Member] | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Actual 18.00% 14.00%  
Long Short Equity [Member] | Multi-strategy hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
Actual 41.00% 44.00%  
Arbitrage and Event Investments [Member] | Multi-strategy hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
Actual 34.00% 54.00%  
Directional Trading, Fixed Income and Other Investments [Member] | Multi-strategy hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
Actual 25.00% 2.00%  
S&P Mid Cap 400 Index Funds [Member] | Other common collective trusts      
Defined Benefit Plan Disclosure [Line Items]      
Actual 15.00%    
Emerging markets | Other common collective trusts      
Defined Benefit Plan Disclosure [Line Items]      
Actual 10.00%    
Russell 1000 Fund Large Cap Index Funds [Member] | Other common collective trusts      
Defined Benefit Plan Disclosure [Line Items]      
Actual 31.00% 39.00%  
Buyout Private Equity Funds [Member] | Private equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Actual 44.00% 43.00%  
Special Situation Private Equity and Debt Funds [Member] | Private equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Actual 32.00% 34.00%  
Venture Private Equity Funds [Member] | Private equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Actual 24.00% 23.00%