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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance $ 1,882.3
Other comprehensive income (loss) before income taxes and reclassifications (25.6)
Income tax expense (6.8)
Reclassifications to earnings 3.2
Other comprehensive (loss) income (29.2)
Ending balance 1,885.6
Foreign Currency Translation Adjustment [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance (178.4)
Other comprehensive income (loss) before income taxes and reclassifications (49.1)
Other comprehensive (loss) income (49.1)
Ending balance (227.5)
Unrealized Gain (Loss) from Invested Customer Trust Funds [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance 10.2
Other comprehensive income (loss) before income taxes and reclassifications 23.4
Income tax expense (6.0)
Other comprehensive (loss) income 17.4
Ending balance 27.6
Pension Liability Adjustment [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance (170.2)
Other comprehensive income (loss) before income taxes and reclassifications 0.1
Income tax expense (0.8)
Reclassifications to earnings 3.2
Other comprehensive (loss) income 2.5
Ending balance (167.7)
Accumulated Other Comprehensive Income (Loss) [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance (338.4)
Ending balance $ (367.6)