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Earnings per Share (Narrative) (Details) | 12 Months Ended
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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

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- 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

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- 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

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