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Debt and Credit Facility - Components (Details) - USD ($) $ in Millions | Sep. 30, 2018 | May 31, 2018 | Mar. 31, 2018 | Feb. 28, 2017 | Feb. 28, 2015
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Debt Instrument [Line Items] |  |  |  |  |
Amount of unamortized debt discount of debentures | $ (1,327.0) | $ (10.5) | $ (1,372.9) |  |
Debt issuance costs | (101.2) | $ (24.4) | (40.1) | $ (33.7) |
2023 Senior Secured Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount of unamortized debt discount of debentures | (4.9) |  | 0.0 |  |
Debt issuance costs | (11.4) |  | 0.0 |  |
2021 Senior Secured Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount of unamortized debt discount of debentures | (4.7) |  | 0.0 |  |
Debt issuance costs | (10.8) |  | 0.0 |  |
2017 Senior Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount of unamortized debt discount of debentures | (589.4) |  | (616.3) |  |
Debt issuance costs | (15.4) |  | (16.1) |  |
2015 Senior Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount of unamortized debt discount of debentures | (376.2) |  | (400.3) |  |
Debt issuance costs | (13.8) |  | (14.8) |  |
2017 Junior Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount of unamortized debt discount of debentures | (351.8) |  | (356.3) |  |
Debt issuance costs | (3.3) |  | (3.3) |  | $ (30.3)
Revolving Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt issuance costs | (16.5) |  | (5.9) |  |
Term Loan Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt issuance costs | $ (30.0) |  | $ 0.0 |  |

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