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Description of Business and Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2019
Accounting Policies [Abstract] |
Restrictions on Cash and Cash Equivalents | The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the Consolidated Balance Sheets that sum to the total of the same amounts in the Consolidated Statements of Cash Flows.
(in millions) |  | March 31, 2019 |  | December 31, 2018 |  | March 31, 2018 |  | December 31, 2017
Cash and cash equivalents |  | $ | 285.0 |  |  | $ | 205.8 |  |  | $ | 221.0 |  |  | $ | 144.2 |
Restricted cash: |  |  |  |  |  |  |  |
Prepaid expenses and other |  | 5.7 |  |  | — |  |  | — |  |  | — |
Total cash, cash equivalents and restricted cash shown in the Statement of Cash Flows |  | $ | 290.7 |  |  | $ | 205.8 |  |  | $ | 221.0 |  |  | $ | 144.2 |

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