Revenues and Operating Earnings by Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 679.8	$ 653.7	$ 2,070.4	$ 1,961.1
Operating earnings before corporate allocations related to discontinued operations	75.2	73.5	328.2	301.9
Corporate allocations related to discontinued operations		(9.4)		(16.1)
Operating earnings	75.2	64.1	328.2	285.8
Interest expense, net	24.0	34.2	72.4	96.5
Earnings from continuing operations before income taxes	51.2	29.9	255.8	189.3
Commercial Aircraft
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	507.8	513.9	1,573.2	1,578.4
Operating earnings	66.9	80.4	265.0	271.8
Business Jet
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	172.0	139.8	497.2	382.7
Operating earnings	$ 8.3	$ (6.9)	$ 63.2	$ 30.1