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Employee Benefits - Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 2,690.8 $ 2,966.8 $ 2,709.2
Pension Plan | Level 1, 2, and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 1,626.2 2,141.9  
Pension Plan | Level 1, 2, and 3 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets   53.6  
Pension Plan | Level 1, 2, and 3 | United States Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 281.7 345.1  
Pension Plan | Level 1, 2, and 3 | International Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 280.4 352.9  
Pension Plan | Level 1, 2, and 3 | United States Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 962.5 1,031.5  
Pension Plan | Level 1, 2, and 3 | International Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 101.6 104.6  
Pension Plan | Level 1, 2, and 3 | Private Equity and Real Estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets   254.2  
Pension Plan | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 701.2 853.5  
Pension Plan | Level 1 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets   0.0  
Pension Plan | Level 1 | United States Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 281.7 345.0  
Pension Plan | Level 1 | International Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 279.7 352.1  
Pension Plan | Level 1 | United States Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 123.7 138.6  
Pension Plan | Level 1 | International Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 16.1 17.8  
Pension Plan | Level 1 | Private Equity and Real Estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets   0.0  
Pension Plan | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 925.0 1,187.5  
Pension Plan | Level 2 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets   53.6  
Pension Plan | Level 2 | United States Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.1  
Pension Plan | Level 2 | International Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.7 0.0  
Pension Plan | Level 2 | United States Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 838.8 892.9  
Pension Plan | Level 2 | International Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 85.5 86.8  
Pension Plan | Level 2 | Private Equity and Real Estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets   154.1  
Pension Plan | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 100.9  
Pension Plan | Level 3 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets   0.0  
Pension Plan | Level 3 | United States Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
Pension Plan | Level 3 | International Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.8 0.0
Pension Plan | Level 3 | United States Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0 0.8
Pension Plan | Level 3 | International Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
Pension Plan | Level 3 | Private Equity and Real Estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 100.1 14.6
Pension Plan | Investments measured at net asset value per share      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 1,064.6 824.9  
OPEB Plan      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 771.7 841.5 773.5
OPEB Plan | Level 1, 2, and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 467.0 538.1  
OPEB Plan | Level 1, 2, and 3 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets   21.9  
OPEB Plan | Level 1, 2, and 3 | United States Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 88.2 101.0  
OPEB Plan | Level 1, 2, and 3 | International Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 92.4 115.5  
OPEB Plan | Level 1, 2, and 3 | United States Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 270.4 269.1  
OPEB Plan | Level 1, 2, and 3 | International Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 16.0 16.3  
OPEB Plan | Level 1, 2, and 3 | Private Equity and Real Estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets   14.3  
OPEB Plan | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 307.1 364.1  
OPEB Plan | Level 1 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets   19.6  
OPEB Plan | Level 1 | United States Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 88.2 101.0  
OPEB Plan | Level 1 | International Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 92.2 115.3  
OPEB Plan | Level 1 | United States Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 119.6 121.0  
OPEB Plan | Level 1 | International Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 7.1 7.2  
OPEB Plan | Level 1 | Private Equity and Real Estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets   0.0  
OPEB Plan | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 159.9 166.1  
OPEB Plan | Level 2 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets   2.3  
OPEB Plan | Level 2 | United States Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
OPEB Plan | Level 2 | International Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.2 0.0  
OPEB Plan | Level 2 | United States Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 150.8 148.1  
OPEB Plan | Level 2 | International Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 8.9 9.1  
OPEB Plan | Level 2 | Private Equity and Real Estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets   6.6  
OPEB Plan | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 7.9  
OPEB Plan | Level 3 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets   0.0  
OPEB Plan | Level 3 | United States Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
OPEB Plan | Level 3 | International Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.2 0.0
OPEB Plan | Level 3 | United States Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
OPEB Plan | Level 3 | International Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
OPEB Plan | Level 3 | Private Equity and Real Estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 7.7 $ 1.3
OPEB Plan | Investments measured at net asset value per share      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 304.7 $ 303.4