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Employee Benefits - Adoption of ASU 2017-07 (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Other operation and maintenance | $ 2,270.5 | $ 2,056.1 | $ 2,171.3
Other income, net | 70.3 | 73.7 | 66.6
Non-service credit (cost) components of net periodic benefit costs | $ 26.0 | 9.1 | (14.2)
2017 Form 10-K Income Statement |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Other operation and maintenance |  | 2,047.0 | 2,185.5
Other income, net |  | 64.6 | 80.8
Impact of ASU 2017-07 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Non-service credit (cost) components of net periodic benefit costs |  | $ 9.1 | $ (14.2)

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