Significant Business Transactions - Acquisition of IFDS U.K. (Details) - USD ($) $ in Millions			6 Months Ended
		Mar. 27, 2017	Jun. 30, 2017	Jun. 30, 2016	Mar. 30, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Ownership percentage			50.00%			50.00%
Acquisition of businesses, net of cash and cash equivalents acquired			$ 38.9	$ 93.5
Goodwill			$ 789.8			$ 516.4
International Financial Data Services U.K.
Business Acquisition [Line Items]
Cash paid to acquire the remaining equity interests in IFDS U.K. and other related interests (1)		$ 141.0
Total consideration transferred		426.2
Payments to acquire notes receivable		25.9
Negotiated fair value		136.8
Remeasurement loss		12.2
Goodwill		195.9
Goodwill expected tax deductible amount		18.9
IFDS Realty U.K. and IFDS Percana
Business Acquisition [Line Items]
Total consideration transferred		68.0
IFDS U.K. IFDS, Percana and IFDS Realty U.K.
Business Acquisition [Line Items]
Cash paid to acquire the remaining equity interests in IFDS U.K. and other related interests (1)	[1]	234.9
Acquisition of businesses, net of cash and cash equivalents acquired		$ 175.0
International Financial Data Services L.P.
Business Acquisition [Line Items]
Ownership percentage		50.00%	50.00%		50.00%

[1] Cash paid is comprised of cash payments to acquire State Street’s equity interest in IFDS U.K. and a note receivable from IFDS U.K., as well as IFDS L.P.’s equity interests in IFDS Percana and IFDS Realty U.K.