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Accumulated Other Comprehensive Loss, Net of Tax (Tables)
 12 Months Ended
Dec. 31, 2019
Subclassifications of assets, liabilities and equities [abstract]  
Disclosure of Detailed Information about Accumulated Other Comprehensive Income
 
 
Year ended December 31
 
Note
2017
 
2018
 
2019
Opening balance of foreign currency translation account
 
$
(15.2
)
 
$
(14.5
)
 
$
(14.4
)
Foreign currency translation adjustments
 
0.7

 
0.1

 
(0.2
)
Closing balance
 
(14.5
)
 
(14.4
)
 
(14.6
)
 
 
 
 
 
 
 
Opening balance of unrealized net gain (loss) on currency forward cash flow hedges
 
$
(9.5
)
 
$
7.8

 
$
(7.7
)
Net gain (loss) on currency forward cash flow hedges(i)
 
27.9

 
(14.7
)
 
6.7

Reclassification of net loss (gain) on currency forward cash flow hedges to operations(ii)
 
(10.6
)
 
(0.8
)
 
4.1

Closing balance(iii)
 
7.8

 
(7.7
)
 
3.1

 
 
 
 
 
 
 
Opening balance of unrealized net gain (loss) on interest rate swap cash flow hedges
 
$
—

 
$
—

 
$
(4.4
)
Net loss on interest rate swap cash flow hedges
 
—

 
(4.8
)
 
(10.2
)
Reclassification of net loss on interest rate swap cash flow hedges to operations
 
—

 
0.4

 
2.5

Closing balance(iv)
 
—

 
(4.4
)
 
(12.1
)
 
 
 
 
 
 
 
Actuarial gains (losses) on pension and non-pension post-employment benefit plans
19
$
(1.2
)
 
$
8.4

 
$
(8.7
)
Reclassification of actuarial losses (gains) to deficit
 
1.2

 
(8.4
)
 
8.7

Loss on purchase of pension annuities
19
(17.0
)
 
(63.3
)
 
—

Reclassification of loss on purchase of pension annuities to deficit
 
19
17.0

 
63.3

 
—

Closing balance
 
—

 
—

 
—

 
 
 
 
 
 
 
Accumulated other comprehensive loss
 
$
(6.7
)
 
$
(26.5
)
 
$
(23.6
)

(i)
Net of income tax expense of $0.2 for 2019 (2018 — net of $1.0 income tax benefit; 2017 — net of $2.8 income tax expense).
(ii)
Net of release of income tax benefit of $0.5 associated with the reclassification of net hedge (gain) loss to operations for 2019 (2018 — net of release of $0.7 of income tax expense; 2017 — net of release of $0.3 of income tax expense).
(iii)
Net of income tax expense of $0.2 as of December 31, 2019 (December 31, 2018 — net of $0.5 of income tax benefit; December 31, 2017 — net of $1.2 of income tax expense).
(iv)
No income tax impact as of December 31, 2019 or December 31, 2018.