Investments in Affiliated Companies (Summarized Financial Data-RRPF) (Details 7) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Income Statement [Abstract]
Lease revenue	$ 651.8		$ 645.5		$ 636.2
Net income	75.3		88.5		55.8
Assets [Abstract]
Current assets	311.0		404.4
Operating assets, net of accumulated depreciation of $651.8 for 2012 and $568.1 for 2011	4,781.3		4,724.4
Total assets	5,092.3		5,128.8
Liabilities and Equity [Abstract]
Current liabilities	439.7		570.7
Long-term debt	3,739.6		3,671.9
Shareholders’ equity	913.0		886.2
Total liabilities and shareholders' equity	5,092.3		5,128.8
RRPF Joint Ventures [Member]
Income Statement [Abstract]
Depreciation expense	(115.1)		(100.1)		(89.1)
Interest expense	(64.8)		(55.5)		(54.5)
Other expenses	(16.3)		(11.5)		(9.1)
Gains on sales of assets	35.9		19.4		3.4
Income before income taxes	93.0		76.5		63.7
Income taxes	(3.8)	[1]	(3.6)	[1]	(11.6)	[1]
Net income	89.2		72.9		52.1
Assets [Abstract]
Current assets	84.8		104.5
Operating assets, net of accumulated depreciation of $651.8 for 2012 and $568.1 for 2011	2,572.2	[2]	2,335.5	[2]
Accumulated depreciation	651.8		568.1
Total assets	2,671.1		2,455.0
Liabilities and Equity [Abstract]
Current liabilities	122.8		141.6
Long-term debt	1,955.1		1,796.6
Other liabilities	217.7		201.1
Shareholders’ equity	375.5		315.7
Total liabilities and shareholders' equity	2,671.1		2,455.0
RRPF Joint Ventures [Member] | Third Parties [Member]
Income Statement [Abstract]
Lease revenue	140.4		127.9		118.2
RRPF Joint Ventures [Member] | Rolls-Royce [Member]
Income Statement [Abstract]
Lease revenue	$ 112.9		$ 96.3		$ 94.8

[1] Represents income taxes directly attributable to the RRPF Affiliates. Several of the RRPF Affiliates are flow through entities and income taxes are incurred at the shareholder level.

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