Investments in Affiliated Companies (Summarized Financial Data-RRPF) (Details 6) $ in Millions		12 Months Ended
		Dec. 31, 2015 USD ($) AircraftEngines	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Income Statement [Abstract]
Lease revenue		$ 339.3	$ 339.0	$ 334.5
Income taxes		(15.4)	(15.2)
Net income		121.4	99.6	108.6
Assets [Abstract]
Current assets		185.0	211.6
Other noncurrent assets		3,254.1	3,195.1
Total assets		3,439.1	3,406.7
Liabilities and Equity [Abstract]
Current liabilities		285.5	378.4
Long-term debt		2,512.2	2,388.2
Shareholders’ equity		641.4	640.1
Total liabilities and shareholders' equity		$ 3,439.1	3,406.7
RRPF Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Number of Aircraft Engines | AircraftEngines		436
Income Statement [Abstract]
Depreciation expense		$ (166.1)	(140.7)	(120.2)
Interest expense		(56.7)	(59.5)	(65.8)
Other expenses		(8.8)	(11.8)	(10.2)
Gains on sales of assets		33.1	22.7	35.2
Income before income taxes		131.6	112.3	106.3
Income taxes	[1]	(9.0)	(17.3)	0.4
Net income		122.6	95.0	106.7
Assets [Abstract]
Current assets		173.4	146.3
Operating assets, net of accumulated depreciation of $744.5 and $651.8	[2]	3,161.4	2,988.1
Total assets		3,334.8	3,134.4
Liabilities and Equity [Abstract]
Current liabilities		85.1	74.4
Long-term debt		2,391.1	2,295.7
Other liabilities		231.4	219.4
Shareholders’ equity		627.2	544.9
Total liabilities and shareholders' equity		3,334.8	3,134.4
RRPF Joint Ventures [Member] | Third Parties [Member]
Income Statement [Abstract]
Lease revenue		191.4	176.9	147.6
RRPF Joint Ventures [Member] | Rolls-Royce [Member]
Income Statement [Abstract]
Lease revenue		$ 138.7	$ 124.7	$ 119.7

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