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Accumulated Other Comprehensive Loss, Net of Tax (Tables)
 12 Months Ended
Dec. 31, 2018
Subclassifications of assets, liabilities and equities [abstract]  
Disclosure of Detailed Information about Accumulated Other Comprehensive Income
 
Year ended
December 31
 
2016
 
2017
 
2018
Opening balance of foreign currency translation account
$
(15.2
)
 
$
(15.2
)
 
$
(14.5
)
Foreign currency translation adjustments
—

 
0.7

 
0.1

Closing balance
(15.2
)
 
(14.5
)
 
(14.4
)
 
 
 
 
 
 
Opening balance of unrealized net gain (loss) on currency forward cash flow hedges
$
(17.6
)
 
$
(9.5
)
 
$
7.8

Net gain (loss) on currency forward cash flow hedges(i)
(2.2
)
 
27.9

 
(14.7
)
Reclassification of net loss (gain) on currency forward cash flow hedges to operations(ii)
10.3

 
(10.6
)
 
(0.8
)
Closing balance(iii)
(9.5
)
 
7.8

 
(7.7
)
 
 
 
 
 
 
Opening balance of unrealized net gain (loss) on interest rate swap cash flow hedges
$
—

 
$
—

 
$
—

Net loss on interest rate swap cash flow hedges
—

 
—

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

 
—

 
0.4

Closing balance(iv)
—

 
—

 
(4.4
)
 
 
 
 
 
 
Actuarial gains (losses) on pension and non-pension post-employment benefit plans (note 19)
$
17.1

 
$
(1.2
)
 
$
8.4

Reclassification of actuarial losses (gains) to deficit
(17.1
)
 
1.2

 
(8.4
)
Loss on purchase of pension annuities (note 19)
—

 
(17.0
)
 
(63.3
)
Reclassification of loss on purchase of pension annuities to deficit
    (note 19)
—

 
17.0

 
63.3

Closing balance
—

 
—

 
—

 
 
 
 
 
 
Accumulated other comprehensive loss
$
(24.7
)
 
$
(6.7
)
 
$
(26.5
)

(i)
Net of income tax benefit of $1.0 for 2018 (2017 — net of $2.8 income tax expense; 2016 — net of $1.2 income tax benefit).
(ii)
Net of release of income tax expense of $0.7 associated with the reclassification of net hedge (gain) loss to operations for 2018 (2017 — net of release of $0.3 income tax expense; 2016 — net of release of $1.1 income tax benefit).
(iii)
Net of income tax benefit of $0.5 as of December 31, 2018 (December 31, 2017 — net of $1.2 income tax expense; December 31, 2016 — net of $1.3 income tax benefit).
(iv)
No income tax impact as of December 31, 2018.