Financial Instruments Schedule of Derivatives Designated as Hedges Affecting Income Statement and Accumulated Other Comprehensive Income (Details) (Designated Hedges [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2011
Derivative instruments, gain (loss) recognized in Other comprehensive income (loss), effective portion, net	$ (3.1)	$ 2.7	$ (7.2)
Derivative instruments, gain (loss) reclassified from Accumulated OCI into Income, effective portion, net	(5.7)	(12.1)	(2.8)
Currency Derivatives [Member]
Derivative instruments, gain (loss) recognized in Other comprehensive income (loss), effective portion, net	(3.0)	(9.8)	(6.1)
Interest Rate Swap and Lock [Member]
Derivative instruments, gain (loss) recognized in Other comprehensive income (loss), effective portion, net	(0.1)	10.5	0
Cost of goods sold [Member] | Currency Derivatives [Member]
Derivative instruments, gain (loss) reclassified from Accumulated OCI into Income, effective portion, net	(3.4)	(10.8)	0.4
Interest Expense [Member] | Interest Rate Swap and Lock [Member]
Derivative instruments, gain (loss) reclassified from Accumulated OCI into Income, effective portion, net	(2.3)	(2.4)	(3.0)
Allegion [Member] | Currency Derivatives [Member]
Derivative instruments, gain (loss) recognized in Other comprehensive income (loss), effective portion, net	0	2.0	(1.1)
Allegion [Member] | Discontinued Operations [Member] | Currency Derivatives [Member]
Derivative instruments, gain (loss) reclassified from Accumulated OCI into Income, effective portion, net	$ 0	$ 1.1	$ (0.2)