Long-term Debt - Credit Agreement (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 20, 2017 USD ($)
Debt Instrument [Line Items]
Payments of Financing Costs	$ 1.1
Debt Issuance Costs, Noncurrent, Net				$ 1.1
Write off of Deferred Debt Issuance Cost	$ 2.0
Net leverage ratio		3.00
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 300.0
Debt Instrument, Maturity Date		Sep. 20, 2022
Debt Instrument, Basis Spread on Variable Rate		1.50%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving Credit Facility, Capacity Available for Foreign Revolver Loans		$ 125.0
Line of Credit Facility, Maximum Borrowing Capacity		300.0
Revolving Credit Facility, Amount Outstanding		0.0	$ 10.8
Revolving Credit Facility, Remaining Borrowing Capacity		284.9	274.3
Letters of credit [Member]
Debt Instrument [Line Items]
Letters of Credit, Maximum Borrowing Capacity		40.0
Letters of Credit Outstanding, Amount		15.1	14.9
U.S. bank debt and receivables facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Unused Borrowing Capacity, Amount			$ 332.1
Revolving credit and term loan facilities [Member]
Debt Instrument [Line Items]
Incremental debt commitments capacity		200.0
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Unused Borrowing Capacity, Amount		$ 284.9