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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
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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