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Effect of New Accounting Pronouncements (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Changes and Error Corrections [Abstract] |
Summary of Cash, Cash Equivalents and Restricted Cash | The following is a reconciliation of our December 31 cash, cash equivalents and restricted cash balances as presented in the consolidated statement of cash flows for the years ended December 31, 2017, 2016 and 2015 (in millions):
|  | December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Cash and cash equivalents |  | $ | 681.2 |  |  | $ | 545.5 |  |  | $ | 480.4 |
Restricted cash |  |  | 1,623.8 |  |  |  | 1,392.1 |  |  |  | 1,412.1 |
Total cash, cash equivalents and restricted cash |  | $ | 2,305.0 |  |  | $ | 1,937.6 |  |  | $ | 1,892.5 |

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- Definition Tabular disclosure of the components of cash and cash equivalents. + References No definition available. + Details
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