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Debt and Credit Facility Components (Details) - USD ($) $ in Millions | Jun. 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 | $ (1,355.7) | $ (10.5) | $ (1,372.9) |  |
Debt issuance costs | (110.0) | $ (24.4) | (40.1) | $ (33.7) |
2023 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount of unamortized debt discount of debentures | (5.2) |  | 0.0 |  |
Debt issuance costs | (12.0) |  | 0.0 |  |
2021 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount of unamortized debt discount of debentures | (5.1) |  | 0.0 |  |
Debt issuance costs | (11.8) |  | 0.0 |  |
December 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt issuance costs | (18.6) |  | (5.9) |  |
Term Loan Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt issuance costs | (34.2) |  | 0.0 |  |
2017 Senior Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount of unamortized debt discount of debentures | (602.9) |  | (616.3) |  |
Debt issuance costs | (15.8) |  | (16.1) |  |
2015 Senior Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount of unamortized debt discount of debentures | (388.4) |  | (400.3) |  |
Debt issuance costs | (14.3) |  | (14.8) |  |
2017 Junior Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount of unamortized debt discount of debentures | (354.1) |  | (356.3) |  |
Debt issuance costs | $ (3.3) |  | $ (3.3) |  | $ (30.3)

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