Leases Cash paid for amounts included in the measurement of lease liabilities (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) railcar	Dec. 31, 2019 USD ($) railcar
Lessee, Lease Terms and Discount Rates [Abstract]
Operating Lease, Payments	$ 58.5	$ 66.5
Finance Lease, Principal Payments	0.0	0.3
Lease, Payments	40.0	11.3
Lease, Payments	98.5	78.1
Non-cash financing lease transactions	$ 64.9	$ 7.8
Number of railcars received | railcar	732	157