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Debt and Credit Facility - Debt Obligations (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] |  |  |  |  |
Long-term debt, gross | $ 12,314.3 |  | $ 4,481.3 |  |
Total Convertible Debt | 4,481.3 |  | 4,481.3 |  |
Less: Debt discount | (1,327.0) | $ (10.5) | (1,372.9) |  |
Less: Debt issuance costs | (101.2) | $ (24.4) | (40.1) | $ (33.7) |
Net long-term debt including current maturities | 10,886.1 |  | 3,068.3 |  |
Current portion of long-term debt | (1,335.0) |  | (1,309.9) |  |
Net long-term debt | 9,551.1 |  | 1,758.4 |  |
Revolving Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Revolving Credit Facility | 3,100.0 |  | 0.0 |  |
Less: Debt issuance costs | (16.5) |  | (5.9) |  |
Term Loan Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | 2,733.0 |  | 0.0 |  |
Less: Debt issuance costs | $ (30.0) |  | 0.0 |  |
2023 Senior Secured Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Coupon Interest Rate | 4.333% | 4.333% |  |  |
Effective Interest Rate |  | 4.333% |  |  |
Long-term debt, gross | $ 1,000.0 |  | 0.0 |  |
Less: Debt discount | (4.9) |  | 0.0 |  |
Less: Debt issuance costs | $ (11.4) |  | 0.0 |  |
2021 Senior Secured Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Coupon Interest Rate | 3.922% | 3.922% |  |  |
Effective Interest Rate |  | 3.922% |  |  |
Long-term debt, gross | $ 1,000.0 |  | 0.0 |  |
Less: Debt discount | (4.7) |  | 0.0 |  |
Less: Debt issuance costs | (10.8) |  | 0.0 |  |
Total Senior Secured Indebtedness |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 7,833.0 |  | 0.0 |  |
2017 Senior Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Coupon Interest Rate | 1.625% |  |  |  |
Effective Interest Rate | 6.00% |  |  |  |
Fair value of liability component at issuance | $ 1,396.3 |  |  |  |
Long-term debt, gross | 2,070.0 |  | 2,070.0 |  |
Less: Debt discount | (589.4) |  | (616.3) |  |
Less: Debt issuance costs | $ (15.4) |  | (16.1) |  |
2015 Senior Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Coupon Interest Rate | 1.625% |  |  |  |
Effective Interest Rate | 5.90% |  |  |  |
Fair value of liability component at issuance | $ 1,160.1 |  |  |  |
Long-term debt, gross | 1,725.0 |  | 1,725.0 |  |
Less: Debt discount | (376.2) |  | (400.3) |  |
Less: Debt issuance costs | $ (13.8) |  | (14.8) |  |
2017 Junior Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Coupon Interest Rate | 2.25% |  |  |  |
Effective Interest Rate | 7.40% |  |  |  |
Fair value of liability component at issuance | $ 321.1 |  |  |  |
Long-term debt, gross | 686.3 |  | 686.3 |  |
Less: Debt discount | (351.8) |  | (356.3) |  |
Less: Debt issuance costs | $ (3.3) |  | $ (3.3) |  | $ (30.3)

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