Pensions and Postretirement Benefits Other Than Pensions (Schedule of Company's Postretirement Plans Benefit Obligations) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Postretirement [Member]
Benefit obligation at beginning of year	$ 713.3		$ 851.4
Service cost	5.1		6.6
Interest cost	28.1		26.0
Plan participants' contributions	11.4		11.2
Actuarial (gains) losses	11.7		(109.8)
Benefits paid, net of Medicare Part D subsidy	(67.8)	[1]	(56.4)	[1]
Other, including expenses paid	(1.1)		(1.6)
Benefit obligation at end of year	700.7		713.3
Allegion [Member]
Increase (Decrease) in Pension Plan Obligations	0		(631.1)
Allegion [Member] | Postretirement [Member]
Increase (Decrease) in Postretirement Obligations	$ 0		$ (14.1)

[1] Amounts are net of Medicare Part D subsidy of $0.1 million and $12.8 million in 2014 and 2013, respectively