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Pension Plans and Other Benefits - Plan Asset FV Measurements - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure    
Fair value of asset $ 845.2 $ 790.6
Fair Value Inputs Level 1    
Defined Benefit Plan Disclosure    
Fair value of asset 4.6 3.4
Fair Value Inputs Level 2    
Defined Benefit Plan Disclosure    
Fair value of asset 839.5 785.7
Fair Value Inputs Level 3    
Defined Benefit Plan Disclosure    
Fair value of asset $ 1.1 $ 1.5
Debt Security, Corporate, US    
Defined Benefit Plan Disclosure    
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 48.00% 46.00%
US and Canada Government Debt Securities    
Defined Benefit Plan Disclosure    
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 45.00% 49.00%
Canadian Equity Securities    
Defined Benefit Plan Disclosure    
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 0.00% 18.00%
Cash And Cash Equivalents    
Defined Benefit Plan Disclosure    
Fair value of asset $ 4.6 $ 3.4
Cash And Cash Equivalents | Fair Value Inputs Level 1    
Defined Benefit Plan Disclosure    
Fair value of asset 4.6 3.4
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] 198.5 216.4
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] 198.5 216.4
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] 641.0 569.3
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] 641.0 569.3
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 1.1 1.5
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 $ 1.1 $ 1.5
Other Foreign    
Defined Benefit Plan Disclosure    
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage   47.00%
U.S. Government Bonds    
Defined Benefit Plan Disclosure    
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 43.00% 35.00%
Debt Security, Corporate, Non-US    
Defined Benefit Plan Disclosure    
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 7.00% 5.00%
[1] This class, which includes several funds, was invested approximately 43% in U.S. equity securities, 0% in Canadian equity securities and 57% in other international equity securities as of December 31, 2020, and 35% in U.S. equity securities, 18% in Canadian equity securities and 47% in other international equity securities as of December 31, 2019.
[2] This class, which includes several funds, was invested approximately 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, and 46% in corporate debt securities, 49% in governmental securities in the U.S. and Canada and 5% in other foreign entity debt securities as of December 31, 2019.