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Employee Benefit Plans Components of Net Periodic Benefit Cost (Credit) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Pension Plan, Defined Benefit [Member]
Dec. 31, 2013
Pension Plan, Defined Benefit [Member]
Dec. 31, 2012
Pension Plan, Defined Benefit [Member]
Dec. 31, 2011
Pension Plan, Defined Benefit [Member]
Dec. 31, 2014
Other Postretirement Benefit Plan, Defined Benefit [Member]
Dec. 31, 2013
Other Postretirement Benefit Plan, Defined Benefit [Member]
Dec. 31, 2012
Other Postretirement Benefit Plan, Defined Benefit [Member]
Dec. 31, 2011
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                        
Service cost           $ 3.4 $ 3.1 $ 4.8   $ 0.4 $ 0.4 $ 0.9
Interest cost           33.8 35.1 37.1   13.2 15.1 17.1
Expected asset return           (45.8) (34.7) (31.9)   0 0 0
Amortized actuarial loss           8.9 7.8 4.5   0.9 0.6 0.4
Amortized prior service cost (credit)           5.4 0.5 (0.1)   (1.8) (2.0) (3.2)
Special and contractual termination benefits       28.7   0 12.8 0   0 16.2 0
Curtailment gain           0 0 0   0 (21.8) 0
Settlement           0 0 0.1   0 (5.2) 0
Net periodic benefit cost           5.7 24.6 14.5        
Other postretirement benefit expense                   12.7 3.3 15.2
Defined benefit plan, acceleration of prior service cost due to remeasurement     4.7                  
Pension and OPEB, period expense, other     28.7                  
Defined benefit plan, amortization of net gains (losses)         5.5       0.5      
Defined benefit plan, amortization of net prior service cost (credit)         0.1       2.7      
Defined benefit plan, health care cost trend rate assumed for next fiscal year   7.50%                    
Defined benefit plan, ultimate health care cost trend rate 5.00%                      
Defined benefit plan, year that rate reaches ultimate trend rate 2019                      
Defined benefit plan, effect of one percentage point increase on service and interest cost components     1.6                  
Defined benefit plan, effect of one percentage point decrease on service and interest cost components     $ 1.4