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Retirement and Other Postretirement Benefit Plans - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
U.S. Non-qualified Defined Benefit Retirement Plans          
Amounts recognized on the balance sheet:          
Employer contribution to defined benefit retirement plans     $ 4.7   $ 25.7
Expected employer contribution in full current year     0.3    
European Defined Benefit Retirement Plans          
Amounts recognized on the balance sheet:          
Employer contribution to defined benefit retirement plans $ 1.3 $ 1.7 2.7 $ 3.1 6.1
Expected employer contribution in next fiscal year     3.9    
Postretirement Health Care and Life Insurance Benefit Plans          
Amounts recognized on the balance sheet:          
Employer contribution to defined benefit retirement plans $ 0.1 $ 0.1 0.1 $ 0.2 $ 0.2
Expected employer contribution in next fiscal year     $ 0.2