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Earnings per Share (Narrative) (Details)	12 Months Ended
	Dec. 31, 2019 shares	Dec. 31, 2018 EquityInstruments
Disclosure of Earnings Per Share [line items]
Antidilutive effect of share options on number of ordinary shares | shares	1,784,029
Stock Options [Member]
Disclosure of Earnings Per Share [line items]
Antidilutive securities excluded from computation of EPS | EquityInstruments		1,266

X

- Definition

The number of anti dilutive potential ordinary shares that relate to the assumed exercise of the entity's share options excluded from the calculation of diluted earnings per share.

+ References

No definition available.

+ Details

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Namespace Prefix:	fsm_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Disclosure of Earnings Per Share [line items].

+ References

No definition available.

+ Details

Name:	fsm_DisclosureOfEarningsPerShareLineItems
Namespace Prefix:	fsm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of antidilutive securities excluded from computation of earnings per share amount.

+ References

No definition available.

+ Details

Name:	fsm_NumberOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	fsm_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	fsm_AntidilutiveSecuritiesAxis=fsm_StockOptionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: