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Pensions and Other Postretirement Benefits (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2017
Components of net annual benefit cost (income):      
Recognized loss due to curtailment $ (3,900,000)    
Pension Plan [Member]      
Components of net annual benefit cost (income):      
Service cost 2,100,000 $ 2,400,000  
Interest cost 11,400,000 12,400,000  
Expected return on plan assets (19,900,000) (21,400,000)  
Amortization of prior service cost (credit) 200,000 200,000  
Recognized net actuarial and other (gain) loss 4,000,000 10,300,000  
Net periodic benefit cost (2,200,000) 3,900,000  
Other Benefits      
Components of net annual benefit cost (income):      
Service cost 0 0  
Interest cost 200,000 200,000  
Expected return on plan assets 0 0  
Amortization of prior service cost (credit) 0 0  
Recognized net actuarial and other (gain) loss (300,000) (300,000)  
Net periodic benefit cost (100,000) (100,000)  
U.S. Defined Benefit Pension Plan      
Pension and Other Postretirement Benefit Contributions [Abstract]      
Voluntary cash contributions made to U.S. defined benefit pension plan $ 0 $ 0  
Scenario, Forecast | U.S. Defined Benefit Pension Plan      
Pension and Other Postretirement Benefit Contributions [Abstract]      
Voluntary cash contributions made to U.S. defined benefit pension plan     $ 40,000,000