Goodwill (Details) (USD $)	12 Months Ended					9 Months Ended
	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2008	Sep. 30, 2013
Goodwill, gross, beginning balance	$ 8,036,600,000		$ 7,988,600,000			$ 7,988,600,000
Acquisitions and adjustments	16,500,000	[1]	0
Currency translation	(167,300,000)		48,000,000
Goodwill, gross, ending balance	7,885,800,000		8,036,600,000	7,988,600,000
Goodwill, Accumulated Impairment Loss	(2,496,000,000)	[2]
Goodwill, net	5,389,800,000		5,540,600,000
Goodwill, Impairment Loss	0		0	0	2,496,000,000
Climate [Member]
Goodwill, gross, beginning balance	7,663,600,000		7,619,900,000			7,619,900,000
Acquisitions and adjustments	13,800,000	[1]	(1,100,000)
Currency translation	(158,500,000)		44,800,000
Goodwill, gross, ending balance	7,518,900,000		7,663,600,000
Goodwill, Accumulated Impairment Loss	(2,496,000,000)	[2]
Goodwill, net	5,022,900,000
Industrial [Member]
Goodwill, gross, beginning balance	373,000,000		368,700,000			368,700,000
Acquisitions and adjustments	2,700,000	[1]	1,100,000
Currency translation	(8,800,000)		3,200,000
Goodwill, gross, ending balance	366,900,000		373,000,000
Goodwill, Accumulated Impairment Loss	0
Goodwill, net	366,900,000
Allegion [Member]
Goodwill, Impairment Loss						111,400,000
March 2014 [Domain]
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds	15,000,000
August 2014 [Domain]
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds	$ 3,000,000

[1] Increase is primarily related to a $15.0 million acquisition in March of 2014 within the Climate segment and a $3.0 million acquisition in August of 2014 within the Industrial segment.

[2] Accumulated impairment relates to a charge of $2,496.0 million recorded in the fourth quarter of 2008 as a result of the Company's annual impairment testing.