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Retirement Benefits (Details 7) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]      
Amortization of net actuarial loss $ 75.0 $ 75.0 $ 88.1
Amortization to net income (loss) of net prior service cost (credits) 0.4 (6.2) 0.7
Remeasurements 92.1 95.8 424.5
Pension Benefits [Member]      
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]      
Beginning of year accumulated other comprehensive loss (1,418.2) (1,352.1)  
Amortization of net actuarial loss 65.4 60.4  
Amortization to net income (loss) of net prior service cost (credits) (1.3) (1.3)  
Remeasurements 111.2 127.8  
End of year accumulated other comprehensive loss (1,462.7) (1,418.2) (1,352.1)
Net change in accumulated other comprehensive loss (44.5) (66.1)  
Other Postretirement Benefits [Member]      
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]      
Beginning of year accumulated other comprehensive loss (101.4) (152.9)  
Amortization of net actuarial loss 9.6 14.6  
Amortization to net income (loss) of net prior service cost (credits) 1.7 (4.9)  
Remeasurements (19.1) (32.0)  
End of year accumulated other comprehensive loss (74.4) (101.4) $ (152.9)
Net change in accumulated other comprehensive loss $ 27.0 $ 51.5