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Benefit Plans Benefit Plans - Allocation of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Private equity funds        
Defined Benefit Plan Disclosure [Line Items]        
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments $ 1.6   $ 2.4  
Foreign Plan [Member] | Asset-backed Securities, Securitized Loans and Receivables | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets     0.0  
Foreign Plan [Member] | Asset-backed Securities, Securitized Loans and Receivables | Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets     0.0  
Foreign Plan [Member] | Asset-backed Securities, Securitized Loans and Receivables | NAV        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets     $ 0.0  
Foreign Plan [Member] | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Target   100.00%    
Actual   100.00% 100.00%  
Fair value of plan assets   $ 325.3 $ 394.4 $ 394.1
Foreign Plan [Member] | Pension Benefits | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   243.5 312.4  
Foreign Plan [Member] | Pension Benefits | Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   14.5 15.9  
Foreign Plan [Member] | Pension Benefits | NAV        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   67.3 66.1  
Foreign Plan [Member] | Pension Benefits | Cash and short-term investments        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   12.1 19.7  
Foreign Plan [Member] | Pension Benefits | Cash and short-term investments | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   11.4 19.7  
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 | NAV        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   0.7 0.0  
Foreign Plan [Member] | Pension Benefits | Mutual funds        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   0.0 0.7  
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 0.7  
Foreign Plan [Member] | Pension Benefits | U.S. small cap core        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   0.0    
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 0.0  
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 | 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 | 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   59.6 58.8  
Foreign Plan [Member] | Pension Benefits | International corporate bonds | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   50.1 58.8  
Foreign Plan [Member] | Pension Benefits | International corporate bonds | Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   0.0 0.0  
Foreign Plan [Member] | Pension Benefits | International corporate bonds | NAV        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   9.5 0.0  
Foreign Plan [Member] | Pension Benefits | U.S. government        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets     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   0.0 0.0  
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   23.7 38.6  
Foreign Plan [Member] | Pension Benefits | Fixed and index funds | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   14.2 18.9  
Foreign Plan [Member] | Pension Benefits | Fixed and index funds | Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Fixed and index funds | NAV        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   9.5 19.7  
Foreign Plan [Member] | Pension Benefits | Real estate        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   25.5 45.8  
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   14.5 15.9  
Foreign Plan [Member] | Pension Benefits | Real estate | NAV        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   11.0 29.9  
Foreign Plan [Member] | Pension Benefits | Other common collective trusts        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   16.8    
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   16.8 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  
Foreign Plan [Member] | Pension Benefits | Multi-strategy hedge funds | Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets     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  
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   17.2 14.0  
Foreign Plan [Member] | Pension Benefits | Other Alternative Investments [Member] | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   0.3 0.4  
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   16.9 13.6  
Foreign Plan [Member] | Pension Benefits | International developed markets        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   170.4 216.8  
Foreign Plan [Member] | Pension Benefits | International developed markets | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   167.5 214.6  
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   $ 2.9 $ 2.2  
Foreign Plan [Member] | Real estate | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Target   8.00%    
Actual   8.00% 12.00%  
Foreign Plan [Member] | Equity securities | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Target   52.00%    
Actual   52.00% 55.00%  
Foreign Plan [Member] | Debt securities | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Target   26.00%    
Actual   26.00% 25.00%  
Foreign Plan [Member] | Other | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Target   14.00%    
Actual   14.00% 8.00%  
U.S. Plans | Asset-backed Securities, Securitized Loans and Receivables | Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets     $ 0.0  
U.S. Plans | Asset-backed Securities, Securitized Loans and Receivables | NAV        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets     $ 0.0  
U.S. Plans | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Target   100.00%    
Actual   100.00% 100.00%  
Fair value of plan assets   $ 293.0 $ 511.3 $ 486.4
U.S. Plans | Pension Benefits | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   2.6 4.1  
U.S. Plans | Pension Benefits | NAV        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   290.4 507.2  
U.S. Plans | Pension Benefits | Cash and short-term investments        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   1.8 2.5  
U.S. Plans | Pension Benefits | Cash and short-term investments | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   1.8 2.5  
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 1.1  
U.S. Plans | Pension Benefits | Mutual funds | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   0.8 1.1  
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. small cap core | Level 1        
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 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 | 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   0.0 0.0  
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 | 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   0.0 0.0  
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 | 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   0.0 0.0  
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   20.1 17.2  
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   20.1 17.2  
U.S. Plans | Pension Benefits | Other common collective trusts        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   263.1 485.9  
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   0.0 0.0  
U.S. Plans | Pension Benefits | Other common collective trusts | NAV        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   263.1 485.9  
U.S. Plans | Pension Benefits | Multi-strategy hedge funds | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets     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  
U.S. Plans | Pension Benefits | Multi-strategy hedge funds | NAV        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets     0.0  
U.S. Plans | Pension Benefits | Private equity funds        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   7.2 4.1  
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   7.2 4.1  
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 | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets   0.0 0.0  
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 | Asset-backed Securities, Securitized Loans and Receivables        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets     0.5  
U.S. Plans | Pension Benefits | Asset-backed Securities, Securitized Loans and Receivables | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets     $ 0.5  
U.S. Plans | Real estate | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Target   4.00%    
Actual   7.00% 3.00%  
U.S. Plans | Equity securities | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Target   41.00%    
Actual   43.00% 46.00%  
U.S. Plans | Debt securities | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Target   50.00%    
Actual   48.00% 50.00%  
U.S. Plans | Other | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Target   5.00%    
Actual   2.00% 1.00%  
Office [Member] | Real estate        
Defined Benefit Plan Disclosure [Line Items]        
Actual   22.00% 31.00%  
Industrial, Cash and Other [Member] | Real estate        
Defined Benefit Plan Disclosure [Line Items]        
Actual   41.00% 33.00%  
Russell 1000 Fund Large Cap Index Funds [Member] | Other common collective trusts        
Defined Benefit Plan Disclosure [Line Items]        
Actual   20.00%    
Buyout Private Equity Funds [Member] | Private equity funds        
Defined Benefit Plan Disclosure [Line Items]        
Actual 26.00% 33.00%    
Special Situation Private Equity and Debt Funds [Member] | Private equity funds        
Defined Benefit Plan Disclosure [Line Items]        
Actual 17.00% 19.00%    
Venture Private Equity Funds [Member] | Private equity funds        
Defined Benefit Plan Disclosure [Line Items]        
Actual 24.00% 29.00%    
Residential [Member] | Real estate        
Defined Benefit Plan Disclosure [Line Items]        
Actual   27.00% 24.00%  
Corporate Debt Securities [Member] | Other common collective trusts        
Defined Benefit Plan Disclosure [Line Items]        
Actual 36.00% 42.00%