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Supplemental Cash Flow Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Supplemental cash flow information |  |  |
Cash (paid) for interest, net of amount capitalized | $ (413.7) | $ (411.9) | $ (329.6)
Cash received (paid) for income taxes, net | 5.2 | 39.7 | (9.3)
Accounts payable related to construction costs | 169.2 | 170.1 | 177.1
Increase (decrease) in restricted cash from the sale (purchase) of investments held in the rabbi trust | 4.6 | (59.2) | (60.2)
Amortization of deferred revenue | 24.9 | 24.7 | 39.9
Restricted cash | 19.7 | 33.6 |
Bostco |  |  |
Supplemental cash flow information |  |  |
Portion of Bostco real estate holdings sale financed with note receivable | 7.0 | 0.0 | 0.0
AMP Trillium LLC |  |  |
Supplemental cash flow information |  |  |
Note receivable received related to the sale of AMP Trillium LLC | 0.0 | 0.0 | 12.0
Capital assets received related to the sale of AMP Trillium LLC | $ 0.0 | $ 0.0 | $ 6.3
Equity method investment, ownership interest (as a percent) |  |  | 30.00%

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