Accounts and Unbilled Receivables - Accounts Receivable and Unbilled Receivables (Details) - USD ($) $ in Millions |
Jun. 30, 2017 |
Jun. 30, 2016 |
|---|---|---|
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Gross accounts receivable | $ 580.0 | $ 505.6 |
| Provision for sales returns and credit losses | (3.7) | (2.6) |
| Total accounts receivable, net | 576.3 | 503.0 |
| Unbilled accounts receivable, net | 159.8 | 135.7 |
| Unbilled Revenues [Member] | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Provision for sales returns and credit losses | (0.8) | (1.2) |
| Gross accounts receivable | $ 160.6 | $ 136.9 |