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Accumulated Other Comprehensive (Loss) Income - Schedule of Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Stockholders equity | $ 732.4 | $ 733.9 | $ 740.4 | $ 746.3
Estimated net mark-to-market loss before tax within next twelve months - cash flow hedges | $ 4.7 |  |  |
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Stockholders equity |  | $ 0.3 | $ 0.3 | 0.9
Accounting Standards Update 2016-01 | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Stockholders equity |  |  |  | $ 0.4

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