Business Segment Information (Summary of Operations by Reportable Segments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Net revenues	$ 3,112.4		$ 3,150.7
Segment operating income	249.0		244.7
Gain (loss) on sale/asset impairment	0		0.3
Operating income	193.5		212.0
Climate Solutions [Member]
Net revenues	1,616.4		1,661.8
Segment operating income	81.2	[1]	94.0	[1]
Residential Solutions [Member]
Net revenues	464.0		421.7
Segment operating income	6.9		(10.7)
Industrial Technologies [Member]
Net revenues	680.3		688.7
Segment operating income	102.1		91.5
Security Technologies [Member]
Net revenues	351.7		378.5
Segment operating income	58.8		69.9
Unallocated Amount to Segment [Member]
Unallocated corporate expense	55.5		33.0
Hussmann Divestiture(Included in Climate Solutions) [Member]
Gain (loss) on sale/asset impairment	$ 0	[1]	$ 0.3	[1]

[1] During the three months ended March 31, 2012, the Company recorded $0.3 million of purchase price adjustments related to the 2011 Hussmann sale. These amounts 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.