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Pension Plans and Other Benefits - Plan Asset FV Measurements - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure    
Fair value of asset $ 807.0 $ 845.2
Fair Value Inputs Level 1    
Defined Benefit Plan Disclosure    
Fair value of asset 5.2 4.6
Fair Value Inputs Level 2    
Defined Benefit Plan Disclosure    
Fair value of asset 791.3 839.5
Fair Value Inputs Level 3    
Defined Benefit Plan Disclosure    
Fair value of asset $ 10.5 $ 1.1
Debt Security, Corporate, US    
Defined Benefit Plan Disclosure    
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 44.00% 48.00%
US and Canada Government Debt Securities    
Defined Benefit Plan Disclosure    
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 49.00% 45.00%
Canadian Equity Securities    
Defined Benefit Plan Disclosure    
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 1.00% 0.00%
Cash And Cash Equivalents    
Defined Benefit Plan Disclosure    
Fair value of asset $ 5.2 $ 4.6
Cash And Cash Equivalents | Fair Value Inputs Level 1    
Defined Benefit Plan Disclosure    
Fair value of asset 5.2 4.6
Cash And Cash Equivalents | Fair Value Inputs Level 2    
Defined Benefit Plan Disclosure    
Fair value of asset 0.0 0.0
Cash And Cash Equivalents | Fair Value Inputs Level 3    
Defined Benefit Plan Disclosure    
Fair value of asset 0.0 0.0
Equity Securities    
Defined Benefit Plan Disclosure    
Fair value of asset [1] 71.3 198.5
Equity Securities | Fair Value Inputs Level 1    
Defined Benefit Plan Disclosure    
Fair value of asset [1] 0.0 0.0
Equity Securities | Fair Value Inputs Level 2    
Defined Benefit Plan Disclosure    
Fair value of asset [1] 71.3 198.5
Equity Securities | Fair Value Inputs Level 3    
Defined Benefit Plan Disclosure    
Fair value of asset [1] 0.0 0.0
Fixed Income Securities    
Defined Benefit Plan Disclosure    
Fair value of asset [2] 720.0 641.0
Fixed Income Securities | Fair Value Inputs Level 1    
Defined Benefit Plan Disclosure    
Fair value of asset [2] 0.0 0.0
Fixed Income Securities | Fair Value Inputs Level 2    
Defined Benefit Plan Disclosure    
Fair value of asset [2] 720.0 641.0
Fixed Income Securities | Fair Value Inputs Level 3    
Defined Benefit Plan Disclosure    
Fair value of asset [2] 0.0 0.0
Private Equity Funds    
Defined Benefit Plan Disclosure    
Fair value of asset 10.5 1.1
Private Equity Funds | Fair Value Inputs Level 1    
Defined Benefit Plan Disclosure    
Fair value of asset 0.0 0.0
Private Equity Funds | Fair Value Inputs Level 2    
Defined Benefit Plan Disclosure    
Fair value of asset 0.0 0.0
Private Equity Funds | Fair Value Inputs Level 3    
Defined Benefit Plan Disclosure    
Fair value of asset $ 10.5 $ 1.1
U.S. Government Bonds    
Defined Benefit Plan Disclosure    
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 44.00% 43.00%
Debt Security, Corporate, Non-US    
Defined Benefit Plan Disclosure    
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 7.00% 7.00%
[1] This class, which includes several funds, was invested approximately 44% in U.S. equity securities, 1% in Canadian equity securities and 55% in other international equity securities as of December 31, 2021, and 43% in U.S. equity securities, 0% in Canadian equity securities and 57% in other international equity securities as of December 31, 2020.
[2] This class, which includes several funds, was invested approximately 44% in corporate debt securities, 49% in governmental securities in the U.S. and Canada and 7% in other foreign entity debt securities as of December 31, 2021, and 48% in corporate debt securities, 45% in governmental securities in the U.S. and Canada and 7% in other foreign entity debt securities as of December 31, 2020.