Investments in Affiliated Companies (Summarized Financial Data-RRPF) (Details 7) (USD $) In Millions, unless otherwise specified	12 Months Ended									3 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 RRPF Joint Ventures [Member] AircraftEngines		Dec. 31, 2012 RRPF Joint Ventures [Member]		Dec. 31, 2011 RRPF Joint Ventures [Member]		Mar. 31, 2012 RRPF Joint Ventures [Member] United Kingdom, statutory rate decreases [Member]		Dec. 31, 2013 RRPF Joint Ventures [Member] United Kingdom, statutory rate decreases [Member]		Dec. 31, 2011 RRPF Joint Ventures [Member] United Kingdom, statutory rate decreases [Member]		Dec. 31, 2013 RRPF Joint Ventures [Member] Third Parties [Member]	Dec. 31, 2012 RRPF Joint Ventures [Member] Third Parties [Member]	Dec. 31, 2011 RRPF Joint Ventures [Member] Third Parties [Member]	Dec. 31, 2013 RRPF Joint Ventures [Member] Rolls-Royce [Member]	Dec. 31, 2012 RRPF Joint Ventures [Member] Rolls-Royce [Member]	Dec. 31, 2011 RRPF Joint Ventures [Member] Rolls-Royce [Member]
Schedule of Equity Method Investments [Line Items]
number of aircraft engines				403
Income Statement [Abstract]
Lease revenue	$ 334.5	$ 651.8	$ 645.5													$ 147.6	$ 140.4	$ 127.9	$ 119.7	$ 112.9	$ 96.3
Depreciation expense				(120.2)		(115.1)		(100.1)
Interest expense				(65.8)		(64.8)		(55.5)
Other expenses				(10.2)		(16.3)		(11.5)
Gains on sales of assets				35.2		35.9		19.4
Income before income taxes				106.3		93.0		76.5
Income taxes				0.4	[1]	(3.8)	[1]	(3.6)	[1]	4.6	[1]	7.6	[1]	4.1	[1]
Net income	108.6	75.3	88.5	106.7		89.2		72.9
Assets [Abstract]
Current assets	200.5	311.0		151.0		84.8
Operating assets, net of accumulated depreciation of $744.5 and $651.8				2,619.6	[2]	2,572.2	[2]
Accumulated depreciation				744.5		651.8
Other noncurrent assets	2,989.2	4,781.3		0		14.1
Total assets	3,189.7	5,092.3		2,770.6		2,671.1
Liabilities and Equity [Abstract]
Current liabilities	159.6	439.7		141.0		122.8
Long-term debt	2,408.8	3,739.6		1,963.1		1,955.1
Other liabilities				212.4		217.7
Shareholders’ equity	621.3	913.0		454.1		375.5
Total liabilities and shareholders' equity	$ 3,189.7	$ 5,092.3		$ 2,770.6		$ 2,671.1

[1] (1) Represents income taxes directly attributable to the RRPF affiliates in the United Kingdom. Several of the RRPF affiliates are flow through entities and income taxes are incurred at the shareholder level. Amounts include tax benefits of $7.6 million, $4.6 million, and $4.1 million in 2013, 2012, and 2011, attributable to statutory rate decreases in the United Kingdom.

[2] (a) All operating assets were pledged as collateral for long-term debt obligations.