v3.25.2
Customer Funds - Gross Unrealized Losses and Related Fair Value of Investment (Detail)
$ in Millions
Jun. 30, 2025
USD ($)
Debt Securities, Available-for-sale [Line Items]  
Less than 12 months, Unrealized Losses $ (0.8)
Less than 12 months, Fair Value 174.2
12 months or more, Unrealized Losses (19.0)
12 months or more, Fair Value 852.5
Total, Unrealized Losses (19.8)
Total, Fair Value 1,026.7
U.S. Government and Agencies Securities [Member]  
Debt Securities, Available-for-sale [Line Items]  
Less than 12 months, Unrealized Losses (0.6)
Less than 12 months, Fair Value 96.7
12 months or more, Unrealized Losses (13.5)
12 months or more, Fair Value 388.6
Total, Unrealized Losses (14.1)
Total, Fair Value 485.3
Canadian and Provincial Government Securities [Member]  
Debt Securities, Available-for-sale [Line Items]  
Less than 12 months, Unrealized Losses 0.0
Less than 12 months, Fair Value 10.0
12 months or more, Unrealized Losses (1.9)
12 months or more, Fair Value 158.4
Total, Unrealized Losses (1.9)
Total, Fair Value 168.4
Corporate Debt Securities [Member]  
Debt Securities, Available-for-sale [Line Items]  
Less than 12 months, Unrealized Losses (0.1)
Less than 12 months, Fair Value 39.1
12 months or more, Unrealized Losses (2.9)
12 months or more, Fair Value 240.5
Total, Unrealized Losses (3.0)
Total, Fair Value 279.6
Asset-backed Securities [Member]  
Debt Securities, Available-for-sale [Line Items]  
Less than 12 months, Unrealized Losses 0.0
Less than 12 months, Fair Value 12.5
12 months or more, Unrealized Losses (0.3)
12 months or more, Fair Value 33.5
Total, Unrealized Losses (0.3)
Total, Fair Value 46.0
Mortgage-backed Securities [Member]  
Debt Securities, Available-for-sale [Line Items]  
Less than 12 months, Unrealized Losses (0.1)
Less than 12 months, Fair Value 7.4
12 months or more, Unrealized Losses (0.2)
12 months or more, Fair Value 7.1
Total, Unrealized Losses (0.3)
Total, Fair Value 14.5
Other Securities [Member]  
Debt Securities, Available-for-sale [Line Items]  
Less than 12 months, Fair Value 8.5
12 months or more, Unrealized Losses (0.2)
12 months or more, Fair Value 24.4
Total, Unrealized Losses (0.2)
Total, Fair Value $ 32.9