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Subsequent Events (Details) - Subsequent Event € in Millions, $ in Millions	Feb. 25, 2020 USD ($)	Jan. 17, 2020 EUR (€)	Jan. 17, 2020 USD ($)
Westin Building Exchange
Subsequent Event [Line Items]
Cash and equity consideration \| $	$ 305.0
Ownership interest	49.00%
Increases our ownership interest	99.00%
Digital Dutch Finco B.V. \| Senior Notes
Subsequent Event [Line Items]
Net proceeds on public offering		€ 1,678.6	$ 1,861.9
Digital Dutch Finco B.V. \| 2022 Notes \| Senior Notes
Subsequent Event [Line Items]
Debt face amount		€ 300.0
Stated interest rate		0.125%
Digital Dutch Finco B.V. \| 2025 Notes \| Senior Notes
Subsequent Event [Line Items]
Debt face amount		€ 650.0
Stated interest rate		0.625%
Digital Dutch Finco B.V. \| 2030 Notes \| Senior Notes
Subsequent Event [Line Items]
Debt face amount		€ 750.0
Stated interest rate		1.50%