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New Accounting Pronouncements (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Net decrease / (increase) in restricted cash and cash equivalents held to satisfy client funds obligations |  | $ 0.0 |
Net cash flows provided by / (used in) investing activities | $ (1,326.3) | (493.8) |
Effect of exchange rate changes on cash, cash equivalents, restricted cash, and restricted cash equivalents |  | (55.1) |
Net change in cash, cash equivalents, restricted cash, and restricted cash equivalents |  | (3,737.1) |
Cash, cash equivalents, restricted cash, and restricted cash equivalents, end of period | $ 13,859.8 | 11,721.5 | $ 8,181.6
Accounting Standards Update 2016-18 | As previously reported |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Net decrease / (increase) in restricted cash and cash equivalents held to satisfy client funds obligations |  | 3,213.0 |
Net cash flows provided by / (used in) investing activities |  | 2,719.2 |
Effect of exchange rate changes on cash, cash equivalents, restricted cash, and restricted cash equivalents |  | (16.9) |
Net change in cash, cash equivalents, restricted cash, and restricted cash equivalents |  | (485.9) |
Cash, cash equivalents, restricted cash, and restricted cash equivalents, end of period |  | 2,705.2 |
Accounting Standards Update 2016-18 | Adjustments |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Net decrease / (increase) in restricted cash and cash equivalents held to satisfy client funds obligations |  | (3,213.0) |
Net cash flows provided by / (used in) investing activities |  | (3,213.0) |
Effect of exchange rate changes on cash, cash equivalents, restricted cash, and restricted cash equivalents |  | (38.2) |
Net change in cash, cash equivalents, restricted cash, and restricted cash equivalents |  | (3,251.2) |
Cash, cash equivalents, restricted cash, and restricted cash equivalents, end of period |  | $ 9,016.3 |

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- Definition Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49171198&loc=d3e33268-110906 + Details
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- Definition Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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