Description of Business (Details) $ in Millions	1 Months Ended	3 Months Ended
	Jan. 31, 2021 USD ($)	Mar. 31, 2021 USD ($) AircraftEngines Segment	Mar. 31, 2020 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of business segments | Segment		3
Payments to Acquire Property, Plant, and Equipment		$ (509.5)	$ (181.0)
Portfolio Management
Schedule of Equity Method Investments [Line Items]
Number of aircraft engines | AircraftEngines		14
Rolls-Royce Aircraft Engines | Portfolio Management
Schedule of Equity Method Investments [Line Items]
Payments to Acquire Property, Plant, and Equipment		$ 352.0
Rolls-Royce Aircraft Engines | Portfolio Management | RRPF
Schedule of Equity Method Investments [Line Items]
Number of aircraft engines | AircraftEngines		4
Payments for asset acquisition	$ 120.0