Pensions and Postretirement Benefits Other Than Pensions (Schedule of Pretax Amounts Recognized in Accumulated Other Comprehensive Income or (Loss)) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Pension Plans [Member]
Balance at December 31, 2013	$ (866.8)
Current year changes recorded to Accumulated other comprehensive income (loss)	(218.4)
Amortization reclassified to earnings	40.5
Settlements/curtailments reclassified to earnings	7.1
Currency translation and other	15.9
Balance at December 31, 2014	(1,021.7)
Pension Plans [Member] | Prior Service Cost [Member]
Balance at December 31, 2013	(17.7)
Current year changes recorded to Accumulated other comprehensive income (loss)	(9.2)
Amortization reclassified to earnings	4.4
Settlements/curtailments reclassified to earnings	0
Currency translation and other	0.2
Balance at December 31, 2014	(22.3)
Pension Plans [Member] | Net Actuarial Losses [Member]
Balance at December 31, 2013	(849.1)
Current year changes recorded to Accumulated other comprehensive income (loss)	(209.2)
Amortization reclassified to earnings	36.1
Settlements/curtailments reclassified to earnings	7.1
Currency translation and other	15.7
Balance at December 31, 2014	(999.4)
Allegion [Member]
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax		5.6
Allegion [Member] | Pension Plans [Member]
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax		$ 164.8