Description of Business (Details) $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Jan. 31, 2021 USD ($)	Mar. 31, 2021 USD ($)	Jun. 30, 2021 USD ($) AircraftEngines Segment	Jun. 30, 2020 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of business segments | Segment			3
Payments to Acquire Property, Plant, and Equipment			$ (663.4)	$ (391.5)
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