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Summary of Significant Accounting Policies - Impact of Adoption of ASUs on Condensed Consolidated Statement of Cash Flows (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Net (loss) income $ 11.2 $ 0.1
Adjustments to reconcile net (loss) income to net cash used in operating activities:    
Deferred income tax benefit (1.9) (0.2)
Other 0.5 (0.2)
Changes in operating assets and liabilities excluding effects of acquisitions and divestitures:    
Trade and other receivables (3.8) (1.3)
Prepaid expenses and other current assets (7.0) (13.3)
Deferred revenue (0.2) 3.3
Accrued taxes (8.1) 6.3
Other assets and liabilities (2.2) (5.2)
Net cash used in operating activities- continuing operations (8.8) (22.3)
Cash Flows from Investing Activities    
Net cash used in investing activities (117.6) (355.5)
Effect of Exchange Rate Changes on Cash, Restricted Cash, and Equivalents 3.9 (4.5)
Net decrease in cash, restricted cash, and equivalents 1,812.0 (153.3)
Elimination of cash from discontinued operations   1.0
Cash, restricted cash, and equivalents at beginning of period 1,106.3 2,411.8
Cash, restricted cash, and equivalents at end of period $ 2,918.3 2,259.5
As Previously Reported [Member]    
Net (loss) income   (2.6)
Adjustments to reconcile net (loss) income to net cash used in operating activities:    
Deferred income tax benefit   (0.4)
Other   0.4
Changes in operating assets and liabilities excluding effects of acquisitions and divestitures:    
Trade and other receivables   (0.2)
Prepaid expenses and other current assets   (11.4)
Deferred revenue   2.1
Accrued taxes   5.9
Other assets and liabilities   (4.3)
Net cash used in operating activities- continuing operations   (22.3)
Cash Flows from Investing Activities    
Net change in restricted cash and other restricted assets held to satisfy customer trust funds obligations   114.8
Net cash used in investing activities   (240.7)
Effect of Exchange Rate Changes on Cash, Restricted Cash, and Equivalents   (3.4)
Net decrease in cash, restricted cash, and equivalents   (37.4)
Elimination of cash from discontinued operations   1.0
Cash, restricted cash, and equivalents at beginning of period   94.2
Cash, restricted cash, and equivalents at end of period   57.8
Accounting Standards Update 2014-09 [Member] | Adjustments [Member]    
Net (loss) income   2.7
Adjustments to reconcile net (loss) income to net cash used in operating activities:    
Deferred income tax benefit   0.2
Other   (0.6)
Changes in operating assets and liabilities excluding effects of acquisitions and divestitures:    
Trade and other receivables   (1.1)
Prepaid expenses and other current assets   (1.9)
Deferred revenue   1.2
Accrued taxes   0.4
Other assets and liabilities   (0.9)
Accounting Standards Update 2016-18 [Member] | Adjustments [Member]    
Cash Flows from Investing Activities    
Net change in restricted cash and other restricted assets held to satisfy customer trust funds obligations   (114.8)
Net cash used in investing activities   (114.8)
Effect of Exchange Rate Changes on Cash, Restricted Cash, and Equivalents   (1.1)
Net decrease in cash, restricted cash, and equivalents   (115.9)
Cash, restricted cash, and equivalents at beginning of period   2,317.6
Cash, restricted cash, and equivalents at end of period   $ 2,201.7