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Income Taxes Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Non-current |  |
Future tax benefits | $ 430.4 | $ 382.8
Employee benefits and compensation | 222.0 | 229.9
Deferred revenues | 207.2 | 219.9
Property-related | 54.5 | 59.5
Other | 230.6 | 177.1
Total deferred tax assets | 1,144.7 | 1,069.2
Valuation allowance | (15.0) | (17.1)
Net deferred tax assets | 1,129.7 | 1,052.1
Non-current |  |
Property-related | 4,979.3 | 4,451.5
Investment in transmission affiliate | 476.9 | 420.4
Employee benefits and compensation | 401.6 | 428.9
Deferred transmission costs | 93.1 | 76.7
Other | 325.4 | 296.9
Total deferred tax liabilities | 6,276.3 | 5,674.4
Deferred tax liability, net | $ 5,146.6 | $ 4,622.3

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