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Summary of Significant Accounting Policies and Procedures and Newly Adopted Accounting Standards - Derivative and Hedging Activities (Details) £ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) | Jul. 31, 2020 USD ($) derivative | Jun. 30, 2020 USD ($) derivative | Dec. 31, 2020 USD ($) | Dec. 31, 2020 GBP (£) derivative hybrid_instrument mortgage | Dec. 31, 2020 USD ($) derivative hybrid_instrument mortgage | Feb. 29, 2020 USD ($) derivative | Dec. 31, 2019 USD ($) | May 31, 2019 GBP (£) derivative | May 31, 2019 USD ($) derivative | Oct. 31, 2018 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Swap exchange notional amount |  |  |  |  |  | $ 1,541,400,000 |  | $ 673,400,000 |  |  |
Number of hybrid debt instruments | hybrid_instrument |  |  |  |  | 2 | 2 |  |  |  |  |
Term loans | $250 million senior unsecured term loan due Mar 2024 |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount of loan |  |  |  |  |  | $ 250,000,000.0 |  | 250,000,000.0 |  |  | $ 250,000,000.0
Notes payable | 0.750% notes, issued in December 2020 and due in March 2026 |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount of loan |  |  |  |  |  | $ 325,000,000.0 |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 0.75% | 0.75% |  |  |  |  |
Notional amount applied to notes payable | $ 100,000,000.0 |  |  |  |  |  |  |  |  |  |
Notes payable | 1.800% notes, issued in December 2020 and due in March 2033 |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount of loan |  |  |  |  |  | $ 400,000,000.0 |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 1.80% | 1.80% |  |  |  |  |
Interest rate swap, maturity Mar 2024 |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of derivative instruments | derivative |  |  |  |  | 1 | 1 |  |  |  |  |
Currency exchange swap | Not designated as hedging instrument |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Swap exchange notional amount |  |  |  |  | £ 463.1 | $ 625,000,000.0 |  | $ 0 |  |  |
Net loss from derivative |  |  |  | $ 14,500,000 |  |  |  |  |  |  |
Treasury rate locks | Cash flow hedge |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of derivative instruments | derivative |  |  |  |  |  |  | 5 |  |  |  |
Swap exchange notional amount |  |  |  |  |  |  | $ 500,000,000.0 |  |  |  |
Number of instruments terminated | derivative |  |  | 5 |  |  |  |  |  |  |  |
Forward starting swaps | Cash flow hedge |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of derivative instruments | derivative |  |  | 6 |  | 6 | 6 |  |  |  |  |
Swap exchange notional amount |  |  | $ 500,000,000.0 |  |  |  |  |  |  |  |
Number of derivative instruments | derivative |  |  |  |  | 4 | 4 |  |  |  |  |
Redesignated forward starting swaps |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Swap exchange notional amount |  | $ 350,000,000.0 |  |  |  |  |  |  |  |  |
Redesignated forward starting swaps | Cash flow hedge |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of derivative instruments | derivative |  |  |  |  | 4 | 4 |  |  |  |  |
Swap exchange notional amount |  |  |  |  |  | $ 350,000,000.0 |  |  |  |  |
Number of instruments being amortized | derivative |  | 4 |  |  |  |  |  |  |  |  |
Other forward starting swaps | Cash flow hedge |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of derivative instruments | mortgage |  |  |  |  | 2 | 2 |  |  |  |  |
Swap exchange notional amount |  |  |  |  |  | $ 150,000,000.0 |  |  |  |  |
Cross-currency swaps | Cash flow hedge |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of derivative instruments | derivative |  |  |  |  |  |  |  |  | 4 | 4 |
Swap exchange notional amount |  |  |  |  |  |  |  |  | £ 130.0 | $ 166,000,000 |

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