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Summary of significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Schedule of Cash and Cash Equivalents | The following table provides a reconciliation of cash and cash equivalents and restricted cash reported within the consolidated balance sheets to the total of the amounts shown in the consolidated statements of cash flows.
As of December 31, |  | 2017 |  | 2016
Cash and cash equivalents |  | $ | 733.9 |  |  | $ | 370.6 |
Restricted cash |  | 30.2 |  |  | 30.5 |
Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows |  | $ | 764.1 |  |  | $ | 401.1 |
Schedule of Restricted Cash and Cash Equivalents | The following table provides a reconciliation of cash and cash equivalents and restricted cash reported within the consolidated balance sheets to the total of the amounts shown in the consolidated statements of cash flows.
As of December 31, |  | 2017 |  | 2016
Cash and cash equivalents |  | $ | 733.9 |  |  | $ | 370.6 |
Restricted cash |  | 30.2 |  |  | 30.5 |
Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows |  | $ | 764.1 |  |  | $ | 401.1 |

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