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Revenues (Details)	3 Months Ended
	Mar. 31, 2018
Minimum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Payment term	30 days
Maximum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Payment term	120 days

X

- Definition

Revenue From Contract With Customer, Payment Term

+ References

No definition available.

+ Details

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Namespace Prefix:	fi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: