Pensions and Postretirement Benefits Other Than Pensions (Schedule of Fair Values of Company's Pension Plan Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Receivables and payables, net	$ 5.7		$ (7.1)	[1]
Real Estate Funds [Member]
Defined benefit plan, fair value of pension plan assets	16.4	[2]	19.3	[2]
Real Estate Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of pension plan assets	0	[2]	0	[2]
Real Estate Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of pension plan assets	0	[2]	0	[2]
Real Estate Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of pension plan assets	16.4	[2]	19.3	[2]
Other Defined Benefit [Member]
Defined benefit plan, fair value of pension plan assets	62.8	[3]	58.1	[3]
Other Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of pension plan assets	0	[3]	0	[3]
Other Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of pension plan assets	0	[3]	0	[3]
Other Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of pension plan assets	62.8	[3]	58.1	[3]
Cash and Cash Equivalents [Member]
Defined benefit plan, fair value of pension plan assets	28.6		42.0
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of pension plan assets	1.3		4.1
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of pension plan assets	27.3		37.9
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of pension plan assets	0		0
Registered mutual funds, equity specialty [Member]
Defined benefit plan, fair value of pension plan assets	6.3	[4]	6.0	[4]
Registered mutual funds, equity specialty [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of pension plan assets	6.3	[4]	6.0	[4]
Registered mutual funds, equity specialty [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of pension plan assets	0	[4]	0	[4]
Registered mutual funds, equity specialty [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of pension plan assets	0	[4]	0	[4]
Equity Securities [Member]
Defined benefit plan, fair value of pension plan assets	840.3		832.8
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of pension plan assets	6.3		6.0
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of pension plan assets	834.0		826.8
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of pension plan assets	0		0
Commingled funds, equity specialty [Member]
Defined benefit plan, fair value of pension plan assets	834.0	[4]	826.8	[4]
Commingled funds, equity specialty [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of pension plan assets	0	[4]	0	[4]
Commingled funds, equity specialty [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of pension plan assets	834.0	[4]	826.8	[4]
Commingled funds, equity specialty [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of pension plan assets	0	[4]	0	[4]
Fixed Income Investments [Member]
Defined benefit plan, fair value of pension plan assets	2,064.8		1,834.1
Fixed Income Investments [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of pension plan assets	33.0		32.3
Fixed Income Investments [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of pension plan assets	2,008.4		1,779.2
Fixed Income Investments [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of pension plan assets	23.4		22.6
Fixed Income Investments [Member] | Registered mutual funds, fixed income specialty [Member]
Defined benefit plan, fair value of pension plan assets	33.0	[5]	32.3	[5]
Fixed Income Investments [Member] | Registered mutual funds, fixed income specialty [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of pension plan assets	33.0	[5]	32.3	[5]
Fixed Income Investments [Member] | Registered mutual funds, fixed income specialty [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of pension plan assets	0	[5]	0	[5]
Fixed Income Investments [Member] | Registered mutual funds, fixed income specialty [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of pension plan assets	0	[5]	0	[5]
Fixed Income Investments [Member] | U.S. Government and Agency Obligations [Member]
Defined benefit plan, fair value of pension plan assets	784.9		702.9
Fixed Income Investments [Member] | U.S. Government and Agency Obligations [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of pension plan assets	0		0
Fixed Income Investments [Member] | U.S. Government and Agency Obligations [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of pension plan assets	784.9		702.9
Fixed Income Investments [Member] | U.S. Government and Agency Obligations [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of pension plan assets	0		0
Fixed Income Investments [Member] | Corporate and Non-U.S. Bonds [Member]
Defined benefit plan, fair value of pension plan assets	823.9	[6]	748.4	[6]
Fixed Income Investments [Member] | Corporate and Non-U.S. Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of pension plan assets	0	[6]	0	[6]
Fixed Income Investments [Member] | Corporate and Non-U.S. Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of pension plan assets	823.9	[6]	748.4	[6]
Fixed Income Investments [Member] | Corporate and Non-U.S. Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of pension plan assets	0	[6]	0	[6]
Fixed Income Investments [Member] | Asset-Backed And Mortgage-Backed Securities [Member]
Defined benefit plan, fair value of pension plan assets	45.3		59.4
Fixed Income Investments [Member] | Asset-Backed And Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of pension plan assets	0		0
Fixed Income Investments [Member] | Asset-Backed And Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of pension plan assets	45.3		59.4
Fixed Income Investments [Member] | Asset-Backed And Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of pension plan assets	0		0
Fixed Income Investments [Member] | Commingled Funds - Fixed Income Specialty [Member]
Defined benefit plan, fair value of pension plan assets	354.3	[5]	268.5	[5]
Fixed Income Investments [Member] | Commingled Funds - Fixed Income Specialty [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of pension plan assets	0	[5]	0	[5]
Fixed Income Investments [Member] | Commingled Funds - Fixed Income Specialty [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of pension plan assets	354.3	[5]	268.5	[5]
Fixed Income Investments [Member] | Commingled Funds - Fixed Income Specialty [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of pension plan assets	0	[5]	0	[5]
Fixed Income Investments [Member] | Other Fixed Income [Member]
Defined benefit plan, fair value of pension plan assets	23.4	[7]	22.6	[7]
Fixed Income Investments [Member] | Other Fixed Income [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of pension plan assets	0	[7]	0	[7]
Fixed Income Investments [Member] | Other Fixed Income [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of pension plan assets	0	[7]	0	[7]
Fixed Income Investments [Member] | Other Fixed Income [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of pension plan assets	23.4	[7]	22.6	[7]
Gross of receivables and payables [Member]
Defined benefit plan, fair value of pension plan assets	3,012.9		2,786.3
Gross of receivables and payables [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of pension plan assets	40.6		42.4
Gross of receivables and payables [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of pension plan assets	2,869.7		2,643.9
Gross of receivables and payables [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of pension plan assets	102.6		100.0
Net of receivables and payables [Member]
Defined benefit plan, fair value of pension plan assets	$ 3,018.6		$ 2,779.2

[1] Includes an estimated $20.0 million payable to Allegion in accordance with the terms of the Employee Matters Agreement.

[2] This class includes private equity funds that invest in real estate, including funds of funds.

[3] This investment comprises the Company’s non-significant, non-U.S. pension plan assets. It mostly includes insurance contracts.

[4] This class comprises commingled and registered mutual funds that focus on equity investments. It includes both indexed and actively managed funds

[5] This class comprises commingled and registered mutual funds that focus on fixed income securities.

[6] This class includes state and municipal bonds.

[7] This class includes group annuity and guaranteed interest contracts.