Employee Benefit Plans (Textuals) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Percentage of medical coverage cost payable by participants	100.00%
Amendments		$ 3.2
Decrease in projected benefit obligation		$ 50.6
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated prior service (cost) credits	$ 0.1
Estimated actuarial gains (losses)	$ 7.9
Long-term rate of return on assets assumption (as a percent)	6.50%	7.50%	7.50%
Discount rate (as a percent)	4.32%	3.66%
Fixed Income, Money Market, Cash and Guaranteed Investment Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Target (as a percent)	60.00%
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target (as a percent)	40.00%
International Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Target (as a percent)	15.00%
U.S. Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Target (as a percent)	25.00%
UNITED KINGDOM
Defined Benefit Plan Disclosure [Line Items]
Components of fair value in our plan assets	7.00%
Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation (as a percent)	89.00%
Plan assets (as a percent)	88.00%
Components of fair value in our plan assets	87.00%
CANADA
Defined Benefit Plan Disclosure [Line Items]
Components of fair value in our plan assets	6.00%