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Employee Benefits - Pension and Post Retirement Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
International bonds      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets   $ 8.1  
Pension Plan Assets      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets $ 2,709.2 2,755.1 $ 1,444.6
Fair value of plan assets subject to levelling 1,343.0 1,181.0  
Pension Plan Assets | Cash and cash equivalents      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 61.7 46.6  
Pension Plan Assets | United states equity      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 274.0 136.0  
Pension Plan Assets | International equity      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 54.7 103.9  
Pension Plan Assets | United States bonds      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 862.1 808.7  
Pension Plan Assets | International bonds      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 75.9 80.3  
Pension Plan Assets | Private Placement      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 14.6 5.5  
Pension Plan Assets | Investments measured at net asset value      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 1,366.2 1,574.1  
Pension Plan Assets | Level 1      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 331.7 264.9  
Pension Plan Assets | Level 1 | Cash and cash equivalents      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 3.7 17.0  
Pension Plan Assets | Level 1 | United states equity      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 273.9 132.6  
Pension Plan Assets | Level 1 | International equity      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 54.1 103.9  
Pension Plan Assets | Level 1 | United States bonds      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 11.4  
Pension Plan Assets | Level 1 | International bonds      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Pension Plan Assets | Level 1 | Private Placement      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Pension Plan Assets | Level 2      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 995.9 910.6  
Pension Plan Assets | Level 2 | Cash and cash equivalents      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 58.0 29.6  
Pension Plan Assets | Level 2 | United states equity      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 0.1 3.4  
Pension Plan Assets | Level 2 | International equity      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 0.6 0.0  
Pension Plan Assets | Level 2 | United States bonds      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 861.3 797.3  
Pension Plan Assets | Level 2 | International bonds      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 75.9 80.3  
Pension Plan Assets | Level 2 | Private Placement      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Pension Plan Assets | Level 3      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 15.4 5.5  
Pension Plan Assets | Level 3 | Cash and cash equivalents      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Pension Plan Assets | Level 3 | United states equity      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Pension Plan Assets | Level 3 | International equity      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Pension Plan Assets | Level 3 | United States bonds      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 0.8 0.0  
Pension Plan Assets | Level 3 | International bonds      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Pension Plan Assets | Level 3 | Private Placement      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 14.6 5.5 0.0
OPEB Plan Assets      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 773.5 749.8 333.5
Fair value of plan assets subject to levelling 218.2 188.4  
OPEB Plan Assets | Cash and cash equivalents      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 32.2 11.5  
OPEB Plan Assets | United states equity      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 34.3 24.7  
OPEB Plan Assets | International equity      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 3.7 21.4  
OPEB Plan Assets | United States bonds      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 137.9 122.3  
OPEB Plan Assets | International bonds      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 8.8    
OPEB Plan Assets | Private Placement      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 1.3 0.4  
OPEB Plan Assets | Investments measured at net asset value      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 555.3 561.4  
OPEB Plan Assets | Level 1      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 66.6 56.8  
OPEB Plan Assets | Level 1 | Cash and cash equivalents      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 28.8 10.5  
OPEB Plan Assets | Level 1 | United states equity      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 34.3 24.6  
OPEB Plan Assets | Level 1 | International equity      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 3.5 21.4  
OPEB Plan Assets | Level 1 | United States bonds      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.3  
OPEB Plan Assets | Level 1 | International bonds      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
OPEB Plan Assets | Level 1 | Private Placement      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
OPEB Plan Assets | Level 2      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 150.3 131.2  
OPEB Plan Assets | Level 2 | Cash and cash equivalents      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 3.4 1.0  
OPEB Plan Assets | Level 2 | United states equity      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.1  
OPEB Plan Assets | Level 2 | International equity      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 0.2 0.0  
OPEB Plan Assets | Level 2 | United States bonds      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 137.9 122.0  
OPEB Plan Assets | Level 2 | International bonds      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 8.8 8.1  
OPEB Plan Assets | Level 2 | Private Placement      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
OPEB Plan Assets | Level 3      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 1.3 0.4  
OPEB Plan Assets | Level 3 | Cash and cash equivalents      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
OPEB Plan Assets | Level 3 | United states equity      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
OPEB Plan Assets | Level 3 | International equity      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
OPEB Plan Assets | Level 3 | United States bonds      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
OPEB Plan Assets | Level 3 | International bonds      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
OPEB Plan Assets | Level 3 | Private Placement      
Employee Benefit Plans      
Defined Benefit Plan, Fair Value of Plan Assets $ 1.3 $ 0.4 $ 0.0