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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
Future Minimum Lease Obligations | Future minimum lease obligations under non-cancelable real property, equipment, and software leases with initial terms in excess of one year at December 31, 2017, are as follows:
Noncancelable Lease Commitments | Capital |  | Operating(1)
2018 | $ | 21.0 |  |  | $ | 54.3 |
2019 | 34.4 |  |  | 49.9 |
2020 | 9.1 |  |  | 46.1 |
2021 | 8.8 |  |  | 42.3 |
2022 | 8.9 |  |  | 39.2 |
Thereafter | 97.6 |  |  | 301.6 |
Total minimum lease payments | $ | 179.8 |  |  | $ | 533.4 |
Less: Amounts representing interest | (58.0 | ) |  |
| $ | 121.8 |  |  |
(1) | Future minimum operating lease payments do not reflect future minimum sublease income of $1.9 million. Additionally, operating leases that are on a month-to-month basis are not included.

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- Definition Tabular disclosures of future minimum payments as of the date of the latest balance sheet presented, in aggregate and for each of the five succeeding years, under capital leases and operating leases having initial or remaining noncancelable lease terms in excess of one year. For operating leases, the disclosure includes the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. For capital leases, the disclosure includes the total amount of the imputed interest necessary to reduce the minimum lease payments to fair value. + References No definition available. + Details
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