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Rental Expense and Commitments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments and Contingencies [Line Items]
Net rental expense	$ 83.7us-gaap_OperatingLeasesRentExpenseNet	$ 85.3us-gaap_OperatingLeasesRentExpenseNet	$ 84.7us-gaap_OperatingLeasesRentExpenseNet
Income from subleases	8.5us-gaap_OperatingLeasesRentExpenseSubleaseRentals1	7.4us-gaap_OperatingLeasesRentExpenseSubleaseRentals1	8.5us-gaap_OperatingLeasesRentExpenseSubleaseRentals1
Minimum net rental commitments under noncancelable operating leases in 2015	58.2us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
Minimum net rental commitments under noncancelable operating leases in 2016	47.2us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
Minimum net rental commitments under noncancelable operating leases in 2017	38.9us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
Minimum net rental commitments under noncancelable operating leases in 2018	26.6us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
Minimum net rental commitments under noncancelable operating leases in 2019	19.9us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
Minimum net rental commitments under noncancelable operating leases, thereafter	34.3us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
Future minimum sublease rentals	32.0us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals
Standby letters of credit and surety bonds outstanding	343uis_LettersOfCreditOutstandingAndSuretyBondsAmount
Deposits and collateralized assets	$ 58uis_DepositsAndCollateralizedAssetsAmount

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Letters Of Credit Outstanding And Surety Bonds Amount

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 2

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Contractually required future rental payments receivable on noncancelable subleasing arrangements.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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The total amount of sublease rental income recognized during the period that reduces the entity's rent expense incurred under operating leases.

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