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Basis of Presentation and Accounting Policies - Additional Information (Details) € in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Apr. 30, 2019 USD ($) | Apr. 30, 2019 EUR (€) | Jun. 30, 2020 USD ($) | Sep. 30, 2019 | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |  |
Net proceeds from sale of tax credits | $ 103.5 | € 92.0 |  |  |  |  |
Non-cash impairment charge loss |  |  | $ 66.8 |  | $ 64.0 | $ 66.8 | $ 64.0
Northern Europe | Germany |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Non-cash impairment charge loss |  |  |  |  |  | $ 66.8 |
Minimum |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Percentage of goodwill over fair value of reporting unit |  |  |  | 20.00% |  |  |
Germany |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Non-cash impairment charge loss |  |  | $ 66.8 |  | $ 60.2 |  |

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