Debt (Details Textual) € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2020 EUR (€)
Line of Credit Facility [Line Items]
Other Short-term Borrowings	$ 23.6	$ 15.8
Annual commitment fees	$ 1.2	1.6	$ 2.0
Fixed charge coverage ratio	2.1
Minimum debt covenant fixed charge coverage ratio	1.2
Amount of secured debt available to be borrowed in accordance with public debt covenants	$ 1,717.9
Total debt principal	5,358.5	$ 4,813.9
Foreign Line of Credit [Member]
Line of Credit Facility [Line Items]
Unsecured revolving credit facility | €				€ 35.0
Line of Credit Facility, Remaining Borrowing Capacity | €				7.3
Total debt principal | €				€ 580.0
Line of Credit US [Member]
Line of Credit Facility [Line Items]
Unsecured revolving credit facility	600.0
Line of Credit Facility, Remaining Borrowing Capacity	600.0
Rail Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	250.0
Rail Facility [Member]
Line of Credit Facility [Line Items]
Unsecured revolving credit facility	$ 250.0