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v3.19.1

Debt and Credit Facility - Debt Obligations (Details) - USD ($) $ in Millions | Mar. 31, 2019 | May 31, 2018 | Mar. 31, 2018 | Feb. 28, 2017 | Feb. 28, 2015
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Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 11,659.3 |  | $ 4,481.3 |  |
Total convertible debt | 4,481.3 |  | 4,481.3 |  |
Less: Debt discount | (1,268.7) | $ (10.5) | (1,372.9) |  |
Less: Debt issuance costs | (83.6) | $ (24.4) | (40.1) | $ (33.7) |
Net long-term debt including current maturities | 10,307.0 |  | 3,068.3 |  |
Less: current maturities | (1,360.8) |  | (1,309.9) |  |
Net long-term debt | 8,946.2 |  | 1,758.4 |  |
Revolving Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | 3,266.5 |  | 0.0 |  |
Less: Debt issuance costs | (14.7) |  | (5.9) |  |
Term Loan Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | 1,911.5 |  |  |  |
Less: Debt issuance costs | $ (19.4) |  |  |  |
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 |  |  |  |
Less: Debt discount | (4.4) |  |  |  |
Less: Debt issuance costs | $ (10.2) |  |  |  |
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 |  |  |  |
Less: Debt discount | (3.8) |  |  |  |
Less: Debt issuance costs | (8.8) |  |  |  |
Total Senior Secured Indebtedness |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 7,178.0 |  | 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 | (561.9) |  | (616.3) |  |
Less: Debt issuance costs | $ (14.5) |  | (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 | (351.4) |  | (400.3) |  |
Less: Debt issuance costs | $ (12.8) |  | (14.8) |  | $ (30.3)
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 | (347.2) |  | (356.3) |  |
Less: Debt issuance costs | $ (3.2) |  | $ (3.3) |  |

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