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Supplemental Cash Flow Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Related Party Transaction [Line Items] |  |  |
Cash (paid) for interest, net of amount capitalized | $ (411.9) | $ (329.6) | $ (241.4)
Cash received for income taxes, net | 39.7 |  |
Cash (paid) for income taxes, net |  | (9.3) | (22.0)
Accounts payable related to construction costs | 170.1 | 177.1 | 1.8
Restricted cash used to purchase investments held in the rabbi trust | 59.2 | 60.2 | 0.0
Restricted cash | 33.6 | 118.4 |
Amortization of deferred revenue | 24.7 | 39.9 | 55.7
AMP Trillium LLC [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Note reveivable received related to the sale of AMP Trillium | 0.0 | 12.0 | 0.0
Capital assets received related to the sale of AMP Trillium | $ 0.0 | $ 6.3 | $ 0.0
Equity method investment, ownership interest (as a percent) |  | 30.00% |

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