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Discontinued Operations - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended			0 Months Ended
	Dec. 04, 2013	Dec. 31, 2014	Dec. 31, 2013 Subsidiaries	Dec. 31, 2012	Jan. 31, 2013	Feb. 20, 2013
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of subsidiaries sold			3acta_NumberOfSubsidiariesSold
Consideration from sale of business in cash	$ 327.8
Gain (Loss) on sale of business		16.2	224.9
Income tax expense (benefit) on income (loss) from discontinued operations		10.1	20.4	(5.1)
Procurian
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Consideration from divestiture of business	375.0
Income tax expense (benefit) on income (loss) from discontinued operations		(1.2)
InvestorForce
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Consideration from divestiture of business					23.6
Consideration from sale of business in cash					20.8
Gain (Loss) on sale of business		2.1	15.7
Channel Intelligence
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Consideration from divestiture of business						125.0
Consideration from sale of business in cash						60.5
Gain (Loss) on sale of business		$ 5.8	$ 17.8

Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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