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Derivatives - Narrative (Details) | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) instrument | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) segment | Feb. 12, 2021 USD ($) | Jan. 31, 2021 USD ($) | Dec. 31, 2020 GBP (£) segment | Nov. 19, 2020 USD ($) | Nov. 19, 2020 GBP (£) | Mar. 26, 2020 USD ($) instrument | Mar. 26, 2020 GBP (£) instrument | Jan. 09, 2020 USD ($) | Nov. 30, 2019 GBP (£) instrument £ / $
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Liabilities | $ 106,800,000 |  | $ 88,700,000 |  |  |  |  |  |  |  |  |
Accumulated other comprehensive loss | (2,200,000) |  | (18,600,000) |  |  |  |  |  |  |  |  |
Interest expense | 52,600,000 | $ 72,000,000.0 |  |  |  |  |  |  |  |  |  |
Cash flow hedge losses expected to be reclassified as an increase to interest expense over the next twelve months | 24,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Derivatives designated as hedging instruments |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Liabilities | 90,800,000 |  | 87,000,000.0 |  |  |  |  |  |  |  |  |
Interest rate swaps |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Liabilities | 103,800,000 |  | 87,000,000.0 |  |  |  |  |  |  |  |  |
Derivative, notional amount | $ 1,350,000,000.0 |  | 2,400,000,000.0 | $ 900,000,000.0 |  |  |  |  |  |  |  |
Accumulated other comprehensive loss |  |  |  |  | $ 51,600,000 |  |  |  |  |  |  |
Derivative, fixed interest rate |  |  |  | 2.382% |  |  |  |  |  |  |  |
Interest rate swaps | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate |  |  |  | 0.75% |  |  |  |  |  |  |  |
Interest rate swaps | Cash Flow Hedging | Derivatives designated as hedging instruments |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  | $ 39,900,000 |
Foreign Currency Net Zero Cost Collar Contract - Entered In November 2019 |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount | £ |  |  |  |  |  |  |  |  |  |  |  | £ 100,000,000
Number of derivative instruments | instrument |  |  |  |  |  |  |  |  |  |  |  | 2
Number of derivative instruments settled | instrument |  |  |  |  |  |  |  |  | 1 | 1 |  |
Notional amount settled | £ |  |  |  |  |  |  |  | £ 50,000,000 |  | £ 50,000,000 |  |
Net payment (receipt) after settlement |  |  |  |  |  |  | $ 200,000 |  | $ (1,900,000) |  |  |
Foreign Currency Net Zero Cost Collar Contract - Entered In November 2019 | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Forward exchange rate | £ / $ |  |  |  |  |  |  |  |  |  |  |  | 1.2375
Foreign Currency Net Zero Cost Collar Contract - Entered In November 2019 | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Forward exchange rate | £ / $ |  |  |  |  |  |  |  |  |  |  |  | 1.3475
Foreign Currency Forward Contract - Entered in March 2020 |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  | $ 0 |  |  |  |  |  |  |  |  |
Derivative term of contract |  |  | 3 months |  |  |  |  |  |  |  |  |
Foreign Currency Forward Contract - Entered in June 2020 |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  | $ 107,100,000 |  |  | £ 80,000,000 |  |  |  |  |  |
Number of derivative instruments | segment |  |  | 2 |  |  | 2 |  |  |  |  |  |
Forward exchange rate |  |  | 1.3388 |  |  | 1.3388 |  |  |  |  |  |
Receive Fixed Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  | $ 900,000,000.0 |  |  |  |  |  |  |  |
Number of derivative instruments | instrument | 2 |  |  |  |  |  |  |  |  |  |  |
Pay-Fixed Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  | $ 1,350,000,000 |  |  |  |  |  |  |  |

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