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Additional Financial Information (Tables) | 6 Months Ended
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Sep. 30, 2017
Additional Financial Information [Abstract] |
Schedule of Other Assets [Table Text Block] | The composition of the Company’s other assets is as follows as of September 30, 2017 and March 31, 2017:
| September 30, 2017 |  | March 31, 2017
| (Amounts in millions)
Other current assets |  |  |
Prepaid expenses and other | $ | 45.2 |  |  | $ | 26.1 |
Product inventory | 24.1 |  |  | 23.9 |
Tax credits receivable | 175.1 |  |  | 145.9 |
| $ | 244.4 |  |  | $ | 195.9 |
Other non-current assets |  |  |
Prepaid expenses and other | $ | 38.9 |  |  | $ | 39.9 |
Accounts receivable | 289.2 |  |  | 313.1 |
Tax credits receivable | 85.3 |  |  | 119.8 |
| $ | 413.4 |  |  | $ | 472.8 |
Supplemental Schedule of Non-Cash Investing and Financing Activities | There were no significant non-cash investing or financing activities for the six months ended September 30, 2017 and 2016.

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- Definition Additional Financial Information [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of supplemental cash flow information for the periods presented. + References No definition available. + Details
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- Definition Tabular disclosure of the carrying amounts of other assets. This disclosure includes other current assets and other noncurrent assets. + References No definition available. + Details
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