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Pension and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Defined Benefit Plan, Plan Amendment [Abstract]    
Contribution to pension and other postemployment benefit plans $ 1.5  
Future contributions to pension and other postemployment benefit plans 15.0  
Defined Benefit Pension [Member]    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Total net pension cost and other postretirement benefit cost 1.0 $ 6.2
Other Postretirement Benefit [Member]    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Total net pension cost and other postretirement benefit cost (2.8) (3.0)
Direct Operating Costs and Selling General and Administrative | Defined Benefit Pension [Member]    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Service cost (1) 0.5 2.7
Direct Operating Costs and Selling General and Administrative | Other Postretirement Benefit [Member]    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Service cost (1) 0.0 0.0
Other, Net | Defined Benefit Pension [Member]    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Interest cost (2) 7.3 6.3
Expected return on plan assets (2) (9.1) (9.4)
Amortization of net loss (2) 2.3 7.8
Amortization of prior service credit (2) 0.0 (1.2)
Other, Net | Other Postretirement Benefit [Member]    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Interest cost (2) 0.1 0.1
Amortization of net loss (2) 0.1 0.2
Amortization of prior service credit (2) $ (3.0) $ (3.3)