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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance $ 2,098.2
Other comprehensive income (loss) before income taxes and reclassifications (5.7)
Income tax expense 3.4
Reclassifications to earnings 3.8
Other comprehensive (loss) income 1.5
Ending balance 2,159.3
Foreign Currency Translation Adjustment [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance (159.7)
Other comprehensive income (loss) before income taxes and reclassifications 11.0
Other comprehensive (loss) income 11.0
Ending balance (148.7)
Unrealized Gain (Loss) from Invested Customer Funds [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance 38.4
Other comprehensive income (loss) before income taxes and reclassifications (16.7)
Income tax expense 4.4
Other comprehensive (loss) income (12.3)
Ending balance 26.1
Pension Liability Adjustment [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance (154.7)
Income tax expense (1.0)
Reclassifications to earnings 3.8
Other comprehensive (loss) income 2.8
Ending balance (151.9)
Accumulated Other Comprehensive Income (Loss) [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance (276.0)
Ending balance $ (274.5)