Business Segment Information (Summary of Operations by Reportable Segments) (Details) (USD $) In Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010	Sep. 30, 2011		Sep. 30, 2010
Net revenues	$ 3,928.5		$ 3,730.3	$ 11,328.2		$ 10,367.4
Segment Operating Income	467.6		447.5	1,250.5		1,058.3
Loss on sale/asset impairment	(264.8)		0	(651.6)		0
Operating income	179.7		410.7	518.8		942.7
Hussmann Divestiture(Included in Climate Solutions) [Member]
Net revenues	281.8		319.4	781.7		839.1
Segment Operating Income	30.1		37.3	56.1		72.7
Loss on sale/asset impairment	(264.8)	[1],[2]	0	(651.6)	[1],[2]	0
Climate Solutions [Member]
Net revenues	2,289.7		2,120.8	6,380.0		5,739.6
Segment Operating Income	264.3	[1]	219.8	631.7	[1]	451.6
Residential Solutions [Member]
Net revenues	504.4		575.4	1,569.8		1,611.4
Segment Operating Income	19.0		57.8	67.2		143.2
Industrial Technologies [Member]
Net revenues	696.5		624.3	2,108.9		1,793.2
Segment Operating Income	95.9		79.4	301.6		219.8
Security Technologies [Member]
Net revenues	437.9		409.8	1,269.5		1,223.2
Segment Operating Income	88.4		90.5	250.0		243.7
Unallocated Amount to Segment [Member]
Unallocated corporate expense	$ 23.1		$ 36.8	$ 80.1		$ 115.6

[1] During the three and nine months ended September 30, 2011, the Company recorded a pre-tax loss on sale and impairment charges related to the Hussmann divestiture totaling $264.8 million and $651.6 million, respectively. These charges have been excluded from Segment operating income within the Climate Solutions segment as management excludes these charges from Operating income when making operating decisions about the business.

[2] Included in Loss on sale/asset impairment for the three and nine months ended September 30, 2011 are transaction costs of $8.4 million and $11.6 million, respectively.