Pensions and Other Benefits (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Supplemental Employee Retirement Plans, Defined Benefit [Member]	Jun. 30, 2011 Supplemental Employee Retirement Plans, Defined Benefit [Member]	Jun. 30, 2012 Supplemental Employee Retirement Plans, Defined Benefit [Member]	Jun. 30, 2011 Supplemental Employee Retirement Plans, Defined Benefit [Member]	Jun. 30, 2012 Postretirement benefit plans [Member]	Jun. 30, 2011 Postretirement benefit plans [Member]	Jun. 30, 2012 Postretirement benefit plans [Member]	Jun. 30, 2011 Postretirement benefit plans [Member]	Jun. 30, 2012 Pension Plans, Defined Benefit [Member]	Jun. 30, 2011 Pension Plans, Defined Benefit [Member]	Jun. 30, 2012 Pension Plans, Defined Benefit [Member]	Jun. 30, 2011 Pension Plans, Defined Benefit [Member]	Jun. 30, 2012 Management [Member]	Dec. 31, 2011 Management [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefits paid						$ 0.7	$ 0.8	$ 1.6	$ 1.9	$ 0.1	$ 0.1	$ 0.1	$ 0.1	$ 2.3	$ 2.3	$ 4.7	$ 4.5
Contributions						0.7	0.8	1.6	1.9	0.1	0.1	0.1	0.1	2.0	1.4	3.4	2.3
Liability related to the deferred compensation plans																		2.6	3.4
Market Value of Rabbi Trust																		8.3	8.1
Payment towards deferred compensation plan																		0.5
Pension and other benefits (Textual) [Abstract]
Contribution expense for the defined contribution plan	1.0	0.9		1.8	1.7
Contribution expense related to international benefit plans	$ 0.3	$ 0.3		$ 0.7	$ 0.6
Deferred compensation plan, payment period after termination			1 year