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Derivative Instruments (Narrative) (Details) - USD ($) shares in Thousands, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Derivative [Line Items] |  |  |
Derivative assets | $ 2,547.8 |  | $ 2,496.7
Cross-currency and interest rate derivative contracts |  |  |
Derivative [Line Items] |  |  |
Gain (loss) in changes in the credit risk valuation adjustments associated with our cross-currency and interest rate derivative contracts | (58.1) | $ 37.7 |
Derivative assets | 1,778.0 |  | $ 1,742.8
Counterparty Credit Risk |  |  |
Derivative [Line Items] |  |  |
Derivative assets | $ 604.8 |  |
Ordinary shares | Lionsgate Loan |  |  |
Derivative [Line Items] |  |  |
Number of common stock shares owned (in shares) | 1,250 |  |
Nonvoting Common Stock | Lionsgate Loan |  |  |
Derivative [Line Items] |  |  |
Number of common stock shares owned (in shares) | 1,250 |  |

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