Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Retirement Plans (Details) $ in Millions	12 Months Ended
Retirement Plans (Details) $ in Millions	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CAD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Defined Contribution Plan Disclosure [Line Items]
Recognized defined contribution plan expense	$ 5.3		$ 4.9	$ 4.8
Required years of service for vesting in employer contributions,	2 years	2 years
Deferred Profit Sharing Plan
Defined Contribution Plan Disclosure [Line Items]
Percentage of contributed employee gross pay matched by employer	5.00%	5.00%
Maximum annual contributions per employee		$ 13,615
Group Registered Retirement Savings Plan
Defined Contribution Plan Disclosure [Line Items]
Percentage of contributed employee gross pay matched by employer	6.00%	6.00%
Maximum annual contributions per employee		$ 26,500
Australian Retirement Savings Plan
Defined Contribution Plan Disclosure [Line Items]
Percentage of contributed employee gross pay matched by employer	9.50%	9.50%
U.S. Retirement Savings Plan
Defined Contribution Plan Disclosure [Line Items]
Percentage of contributed employee gross pay matched by employer	6.00%	6.00%
U.S. Retirement Savings Plan \| Minimum
Defined Contribution Plan Disclosure [Line Items]
Maximum annual percent of pay contributed by employee	1.00%	1.00%
U.S. Retirement Savings Plan \| Maximum
Defined Contribution Plan Disclosure [Line Items]
Required years of service for vesting in employer contributions,	3 years	3 years
Maximum annual percent of pay contributed by employee	75.00%	75.00%
U.S. Retirement Savings Plan \| First 4% of employee pay contributed matched at 100%
Defined Contribution Plan Disclosure [Line Items]
Percentage of contributed employee gross pay matched by employer	4.00%	4.00%
Percent of employer matching contribution	100.00%	100.00%
U.S. Retirement Savings Plan \| Next 2% of employee pay contributed matched at 50%
Defined Contribution Plan Disclosure [Line Items]
Percentage of contributed employee gross pay matched by employer	2.00%	2.00%
Percent of employer matching contribution	50.00%	50.00%
U.S. Retirement Savings Plan \| 40% Vesting Rate
Defined Contribution Plan Disclosure [Line Items]
Annual vesting percentage	40.00%	40.00%
U.S. Retirement Savings Plan \| 40% Vesting Rate \| Minimum
Defined Contribution Plan Disclosure [Line Items]
Required years of service for vesting in employer contributions,	2 years	2 years
U.S. Retirement Savings Plan \| 20% Vesting Rate
Defined Contribution Plan Disclosure [Line Items]
Annual vesting percentage	20.00%	20.00%