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Long-Term Debt - Amendments to the Credit Agreement (Details) $ in Millions | 12 Months Ended | 48 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2019 amendment
Debt Instrument [Line Items] |  |  |  |
Number of amendments to credit agreement | amendment |  |  |  | 7
Additional proceeds under term loan | $ 1,858.0 | $ 1,404.8 | $ 15.3 |
Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of Revolving Credit Facility |  | 500.0 |  |
Term Loan B Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Additional proceeds under term loan |  | $ 500.0 |  |

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