Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2018

Property, plant and equipment [abstract]

Disclosure of Detailed Information About Property, Plant and Equipment

We recognize depreciation expense on a straight-line basis over the estimated useful life of the asset as follows:

Buildings	Up to 40 years
Building/leasehold improvements	Up to 40 years or term of lease
Machinery and equipment	3 to 15 years

Property, plant and equipment are comprised of the following:

	2017
	Cost		Accumulated Depreciation and Impairment		Net Book Value
Land	$	23.1	$	12.0	$	11.1
Buildings including improvements	344.0		202.4		141.6
Machinery and equipment	745.5		574.3		171.2
	$	1,112.6	$	788.7	$	323.9

	2018
	Cost		Accumulated Depreciation and Impairment		Net Book Value
Land	$	26.8	$	12.0	$	14.8
Buildings including improvements	375.5		218.0		157.5
Machinery and equipment	781.2		588.2		193.0
	$	1,183.5	$	818.2	$	365.3

The following table details the changes to the net book value of property, plant and equipment for the years indicated:

	Land		Buildings including Improvements			Machinery and Equipment			Total
Balance — January 1, 2017	$	10.9	$	140.1		$	151.7		$	302.7
Additions	—		22.8			72.1			94.9
Depreciation	—		(21.3		)	(46.3		)	(67.6		)
Write down of assets and other disposals (i)	—		(0.2		)	(5.3		)	(5.5		)
Foreign exchange and other	0.2		0.2			(1.0		)	(0.6		)
Balance — December 31, 2017 (ii)	11.1		141.6			171.2			323.9
Additions	—		25.4			62.3			87.7
Acquisitions through business combinations (note 3)	3.6		10.8			13.9			28.3
Depreciation	—		(20.4		)	(53.3		)	(73.7		)
Write down of assets and other disposals	—		—			(0.9		)	(0.9		)
Foreign exchange and other	0.1		0.1			(0.2		)	—
Balance — December 31, 2018 (ii)	$	14.8	$	157.5		$	193.0		$	365.3

(i) Includes $4.8 of solar panel manufacturing equipment that we reclassified as assets held for sale during 2017. In 2017, we recorded net impairment losses of $3.8 primarily to write-down solar panel manufacturing equipment. See note 16(a).

(ii) The net book value of property, plant and equipment at December 31, 2018 included $12.8 (December 31, 2017— $7.3) of assets under finance leases. See note 24 for the future minimum lease payments under these finance leases.