Retirement and Other Postretirement Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
U.S. Non-qualified Defined Benefit Retirement Plans
Net periodic benefit costs of defined benefit retirement plans
Service cost	$ 0.7	$ 0.4	$ 1.4	$ 0.7
Interest cost	0.2	0.2	0.4	0.5
Net amortization and deferral	0.6	0.5	1.3	1.1
Net periodic benefit cost	1.5	1.1	3.1	2.3
Amounts recognized on the balance sheet:
Accrued liabilities	0.3		0.3		0.3
Other non-current liabilities	40.0		40.0		38.3
Total accrued benefit	40.3		40.3		38.6
Expected employer contribution in next fiscal year			0.3
Employer contribution to defined benefit retirement plans					0.3
European Defined Benefit Retirement Plans
Net periodic benefit costs of defined benefit retirement plans
Service cost	0.1	0.2	0.3	0.3
Interest cost	1.8	1.6	3.5	3.3
Expected return on plan assets	(2.1)	(1.8)	(4.1)	(3.6)
Net amortization and deferral	0.3	0.2	0.6	0.4
Net periodic benefit cost	0.1	0.2	0.3	0.4
Amounts recognized on the balance sheet:
Accrued liabilities	0.4		0.4		0.4
Other non-current liabilities	34.8		34.8		36.1
Total accrued benefit	35.2		35.2		36.5
Expected employer contribution in next fiscal year			5.8
Employer contribution to defined benefit retirement plans	1.3	1.5	2.7	3.0	5.7
Postretirement Health Care and Life Insurance Benefit Plans
Amounts recognized on the balance sheet:
Accrued liabilities	0.6		0.6		0.6
Other non-current liabilities	7.4		7.4		7.5
Total accrued benefit	8.0		8.0		8.1
Expected employer contribution in next fiscal year			0.3
Employer contribution to defined benefit retirement plans	0.1		0.2	0.1	0.3
Postretirement Health Care and Life Insurance Benefit Plans | Maximum
Amounts recognized on the balance sheet:
Employer contribution to defined benefit retirement plans		$ 0.1