Retirement and Other Postretirement Benefit Plans (Details) (USD $) In Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Net periodic benefit cost
Curtailment gain			$ (5.7)
U.S. Non-qualified Defined Benefit Retirement Plans
Net periodic benefit cost
Service cost	0.5	0.3	1.0	0.9
Interest cost	0.3	0.3	0.8	0.8
Net amortization and deferral	0.5	0.2	1.1	0.6
Net periodic benefit cost	1.3	0.8	2.9	2.3
Amounts recognized on the balance sheet:
Accrued liabilities	0.9		0.9		0.9
Other non-current liabilities	28.9		28.9		26.9
Total accrued benefit	29.8		29.8		27.8
U.S. Non-qualified Defined Benefit Retirement Plans.
Contributions
Expected employer contribution to defined benefit retirement plans in current year	0.9		0.9
Employer contribution to defined benefit retirement plans					0.6
European Defined Benefit Retirement Plans
Net periodic benefit cost
Service cost	0.1	1.0	1.0	2.9
Interest cost	1.8	1.8	5.4	5.6
Expected return on plan assets	(1.9)	(1.6)	(5.8)	(4.8)
Net amortization and deferral	0.1	0.4	0.4	1.0
Curtailment gain			(5.7)
Net periodic benefit cost	0.1	1.6	(4.7)	4.7
Amounts recognized on the balance sheet:
Accrued liabilities	3.1		3.1		0.5
Other non-current liabilities	15.9		15.9		26.7
Total accrued benefit	19.0		19.0		27.2
Contributions
Expected employer contribution to defined benefit retirement plans in current year	7.4		7.4
Employer contribution to defined benefit retirement plans	2.9	3.5	6.8	6.1	9.0
United Kingdom defined benefit plan (the "U.K. Plan")
Net periodic benefit cost
Curtailment gain			(5.7)
Amounts recognized on the balance sheet:
Reduction in projected plan obligation			1.6
Postretirement Health Care and Life Insurance Benefit Plans
Amounts recognized on the balance sheet:
Accrued liabilities	0.8		0.8		0.8
Other non-current liabilities	8.7		8.7		8.6
Total accrued benefit	9.5		9.5		9.4
Contributions
Expected employer contribution to defined benefit retirement plans in current year	0.4		0.4
Employer contribution to defined benefit retirement plans	$ 0.1	$ 0.1	$ 0.2	$ 0.3	$ 0.4