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Pension Plans and Other Benefits - Plan Asset FV Measurements (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure    
Fair value of asset $ 701.2 $ 793.2
Fair Value Inputs Level 1    
Defined Benefit Plan Disclosure    
Fair value of asset 12.0 14.7
Fair Value Inputs Level 2    
Defined Benefit Plan Disclosure    
Fair value of asset 687.2 775.5
Fair Value Inputs Level 3    
Defined Benefit Plan Disclosure    
Fair value of asset $ 2.0 $ 3.0
Debt Security, Corporate, US [Member]    
Defined Benefit Plan Disclosure    
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 50.00% 55.00%
US and Canada Government Debt Securities [Member]    
Defined Benefit Plan Disclosure    
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 44.00% 42.00%
Canadian Equity Securities [Member]    
Defined Benefit Plan Disclosure    
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 18.00% 25.00%
Cash And Cash Equivalents    
Defined Benefit Plan Disclosure    
Fair value of asset $ 12.0 $ 14.7
Cash And Cash Equivalents | Fair Value Inputs Level 1    
Defined Benefit Plan Disclosure    
Fair value of asset 12.0 14.7
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] 172.9 327.7
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] 172.9 327.7
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] 514.3 447.8
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] 514.3 447.8
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 2.0 3.0
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 $ 2.0 $ 3.0
Other Foreign [Member]    
Defined Benefit Plan Disclosure    
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 43.00% 30.00%
U.S. Government Bonds    
Defined Benefit Plan Disclosure    
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 39.00% 45.00%
Debt Security, Corporate, Non-US [Member]    
Defined Benefit Plan Disclosure    
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 6.00% 3.00%
[1] This class, which includes several funds, was invested approximately 39% in U.S. equity securities, 18% in Canadian equity securities, and 43% in international equity securities as of December 31, 2018, and 45% in U.S. equity securities, 25% in Canadian equity securities, and 30% in international equity securities as of December 31, 2017.
[2] This class, which includes several funds, was invested approximately 50% in corporate debt securities, 44% in governmental securities in the U.S. and Canada, and 6% in foreign entity debt securities as of December 31, 2018, and 55% in corporate debt securities, 42% in governmental securities in the U.S. and Canada, and 3% in foreign entity debt securities as of December 31, 2017.