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Revenues Revenues (Tables)

12 Months Ended

Mar. 31, 2019

Revenue from Contract with Customer [Abstract]

Reconciliation of Revenue from Segments to Consolidated [Table Text Block]

The following represents the Company's disaggregated revenues for the years ended 31 March 2019, 2018 and 2017:

	Year Ended 31 March 2019
(Millions of US dollars)	North America Fiber Cement				Asia Pacific Fiber Cement				Europe Building Products				Other Businesses				Consolidated
Fiber cement revenues	$	1,676.9			$	446.8			$	35.8			$	—			$	2,159.5
Fiber gypsum revenues	—				—				332.5				—				332.5
Other revenues	—				—				—				14.6				14.6
Total revenues	$	1,676.9			$	446.8			$	368.3			$	14.6			$	2,506.6

	Year Ended 31 March 2018
(Millions of US dollars)	North America Fiber Cement				Asia Pacific Fiber Cement				Europe Building Products				Other Businesses				Consolidated
Fiber cement revenues	$	1,578.1			$	425.4			$	36.3			$	—			$	2,039.8
Fiber gypsum revenues	—				—				—				—				—
Other revenues	—				—				—				14.7				14.7
Total revenues	$	1,578.1			$	425.4			$	36.3			$	14.7			$	2,054.5

	Year Ended 31 March 2017
(Millions of US dollars)	North America Fiber Cement				Asia Pacific Fiber Cement				Europe Building Products				Other Businesses				Consolidated
Fiber cement revenues	$	1,493.4			$	370.6			$	41.2			$	—			$	1,905.2
Fiber gypsum revenues	—				—				—				—				—
Other revenues	—				—				—				16.4				16.4
Total revenues	$	1,493.4			$	370.6			$	41.2			$	16.4			$	1,921.6

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- Definition

Tabular disclosure of all significant reconciling items in the reconciliation of total revenues from reportable segments to the entity's consolidated revenues.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8924-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8906-108599

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X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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