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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Non-cash transactions:      
Capital expenditures included in current liabilities $ 152.0 $ 173.0 $ 125.3
Assets acquired under a capital lease 54.6 11.5 4.0
Reclassification of Other Property to Regulatory Assets [1] 245.3 0.0 0.0
Assets recorded for asset retirement obligations [2] 78.1 11.4 6.9
Schedule of interest and income taxes paid:      
Cash paid for interest, net of interest capitalized amounts 354.2 339.9 337.8
Cash paid for income taxes, net of refunds $ 3.3 $ 5.5 $ 8.0
[1] See Note 8 "Regulatory Matters" for additional information.
[2] See Note 7 "Asset Retirement Obligations" for additional information.