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Customer Trust Fund - Gross Unrealized Losses and Related Fair Value of Investment (Detail) $ in Millions | Mar. 31, 2019 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
Less than 12 months, Unrealized Losses | $ (0.1)
Less than 12 months, Fair Value | 50.1
12 months or more, Unrealized Losses | (7.7)
12 months or more, Fair Value | 827.0
Total, Unrealized Losses | (7.8)
Total, Fair Value | 877.1
U.S. Government and Agencies Securities [Member] |
Debt Securities, Available-for-sale [Line Items] |
Less than 12 months, Unrealized Losses | (0.1)
Less than 12 months, Fair Value | 24.7
12 months or more, Unrealized Losses | (5.0)
12 months or more, Fair Value | 384.6
Total, Unrealized Losses | (5.1)
Total, Fair Value | 409.3
Canadian and Provincial Government Securities [Member] |
Debt Securities, Available-for-sale [Line Items] |
12 months or more, Unrealized Losses | (0.3)
12 months or more, Fair Value | 98.7
Total, Unrealized Losses | (0.3)
Total, Fair Value | 98.7
Corporate Debt Securities [Member] |
Debt Securities, Available-for-sale [Line Items] |
Less than 12 months, Fair Value | 16.4
12 months or more, Unrealized Losses | (1.1)
12 months or more, Fair Value | 169.3
Total, Unrealized Losses | (1.1)
Total, Fair Value | 185.7
Asset-backed Securities [Member] |
Debt Securities, Available-for-sale [Line Items] |
Less than 12 months, Fair Value | 5.0
12 months or more, Unrealized Losses | (1.1)
12 months or more, Fair Value | 156.7
Total, Unrealized Losses | (1.1)
Total, Fair Value | 161.7
Mortgage-backed Securities [Member] |
Debt Securities, Available-for-sale [Line Items] |
Less than 12 months, Fair Value | 4.0
12 months or more, Unrealized Losses | (0.1)
12 months or more, Fair Value | 7.4
Total, Unrealized Losses | (0.1)
Total, Fair Value | 11.4
Other Securities [Member] |
Debt Securities, Available-for-sale [Line Items] |
12 months or more, Unrealized Losses | (0.1)
12 months or more, Fair Value | 10.3
Total, Unrealized Losses | (0.1)
Total, Fair Value | $ 10.3

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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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