XML 116 R41.htm IDEA: XBRL DOCUMENT v3.20.1

Nature of Operations (Details)	Dec. 31, 2019
Continuing and discontinued operations [Abstract]
Option to acquire business interest	100.00%

X

- Definition

Continuing and discontinued operations [Abstract]

+ References

No definition available.

+ Details

Name:	agi_ContinuinganddiscontinuedoperationsAbstract
Namespace Prefix:	agi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of Option to Acquire Business Interest

+ References

No definition available.

+ Details

Name:	agi_PercentageofOptiontoAcquireBusinessInterest
Namespace Prefix:	agi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant