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v3.20.1

Subsequent Events (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | May 15, 2020 | May 07, 2020 | May 14, 2020 | Jul. 31, 2018 | Jun. 25, 2018 | May 23, 2018
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Class A Voting Common Shares | Options and SARS, existing | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Awards exchanged (in shares) |  | 1.1 |  |  |  |
Class A Voting Common Shares | Options and SARS, new | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Awards exchanged (in shares) |  | 0.1 |  |  |  |
Awards exchanged, exercise price (in USD per share) |  | $ 7.70 |  |  |  |
Class B Non-Voting Common Shares | Options and SARS, existing | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Awards exchanged (in shares) |  | 4.3 |  |  |  |
Class B Non-Voting Common Shares | Options and SARS, new | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Awards exchanged (in shares) |  | 0.8 |  |  |  |
Awards exchanged, exercise price (in USD per share) |  | $ 7.13 |  |  |  |
Interest Rate Swap |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Fixed interest rate |  |  |  | 2.885% | 2.723% | 2.915%
Interest Rate Swap | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Derivative transaction | $ 1,050.0 |  |  |  |  |
Fixed interest rate | 2.39293% |  | 2.87028% |  |  |
Annual cash interest savings | $ 8.1 |  |  |  |  |
Minimum | Interest Rate Swap | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Extended maturity | 2 years |  |  |  |  |
Maximum | Interest Rate Swap | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Extended maturity | 5 years |  |  |  |  |

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