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Long-Term Debt - U.S. Real Estate Mortgages (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |  |
Repayments of long-term debt | $ 594,400,000 | $ 298,400,000 | $ 1,831,400,000 |
U.S. Real Estate Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount of debt |  |  |  | $ 49,400,000
Repayments of long-term debt | $ 49,400,000 |  |  |

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