Pension and Postretirement Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012		Sep. 30, 2011
Pension Benefits [Member]
Components of net periodic benefit cost
Service cost	$ 1.4	$ 1.3	$ 4.1		$ 4.0
Interest cost	4.3	4.5	12.9		13.5
Expected return on plan assets	(4.7)	(4.7)	(14.1)		(14.2)
Amortization of prior service cost	0.1	0.1	0.3		0.3
Amortization of net loss	2.1	1.7	6.5		5.2
Settlements or curtailments	1.0	0.1	7.3	[1]	1.7	[1]
Total net periodic benefit cost	4.2	3.0	17.0		10.5
Other Benefits [Member]
Components of net periodic benefit cost
Service cost	0	0.2	0.2		0.6
Interest cost	0.1	0.2	0.4		0.7
Expected return on plan assets	0	0	0		0
Amortization of prior service cost	(0.8)	(0.4)	(2.0)		(1.4)
Amortization of net loss	0.4	0.3	1.0		0.9
Settlements or curtailments	0	0	0	[1]	0	[1]
Total net periodic benefit cost	$ (0.3)	$ 0.3	$ (0.4)		$ 0.8

[1] Settlements and curtailments in the nine months ended September 30, 2012 include a $6.3 million settlement charge related to actuarial losses recognized upon transition of a pension obligation to the acquirer of the Lennox Hearth Products business (“Hearth business”).