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Pensions and Post Retirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2018
Pension And Post Retirement Benefits [Abstract]  
Disclosure of defined benefit plans
The funded status of the company's defined benefit pension and post retirement plans at December 31 were as follows:
 
Defined benefit
pension plans
 
Defined benefit post retirement plans
 
2018

 
2017

 
2018

 
2017

Benefit obligation
(803.7
)
 
(918.3
)
 
(112.3
)
 
(118.5
)
Fair value of plan assets
726.9

 
836.1

 
—

 
—

Funded status of plans - deficit
(76.8
)
 
(82.2
)
 
(112.3
)
 
(118.5
)
Impact of asset ceiling
—

 
(1.0
)
 
—

 
—

Net accrued liability (notes 13 and 14)(1)
(76.8
)
 
(83.2
)
 
(112.3
)
 
(118.5
)
Weighted average assumptions used to determine benefit obligations:
 
 
 
 
 
 
 
Discount rate
3.6
%
 
3.2
%
 
4.2
%
 
4.1
%
Rate of compensation increase
2.7
%
 
2.7
%
 
3.6
%
 
3.3
%
Health care cost trend
—

 
—

 
4.6
%
 
5.0
%
(1)
The defined benefit pension plan net accrued liability at December 31, 2018 of $76.8 (December 31, 2017 - $83.2) was comprised of pension surpluses of $64.0 and pension deficits of $140.8 (December 31, 2017 - $49.1 and $132.3).
Pension and post retirement expenses recognized
Pension and post retirement benefit expenses recognized in the consolidated statement of earnings for the years ended December 31 were as follows:
 
2018

 
2017

Defined benefit pension plan expense
26.8

 
17.3

Defined contribution pension plan expense
50.3

 
45.6

Defined benefit post retirement plan expense
9.7

 
10.3

 
86.8

 
73.2
Pre-tax actuarial net gains (losses) recognized in the consolidated statements
Pre-tax actuarial net gains (losses) recognized in the consolidated statement of comprehensive income for the years ended December 31 were comprised as follows:
 
2018

 
2017

Defined benefit pension plans
 
 
 
Actuarial net gains (losses) on plan assets and change in asset ceiling
(69.2
)
 
18.6

Actuarial net gains (losses) on benefit obligations
74.1

 
(53.0
)
 
4.9

 
(34.4
)
Defined benefit post retirement plans - actuarial net gains on benefit obligations
7.3

 
0.3

 
12.2

 
(34.1
)