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Summary of Significant Accounting Policies Lessee Accounting (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items] |  |
Lessee, Operating Lease, Renewal Term | 5 years | 5 years
Lessee, Operating Lease, Termination Option Term |  | 1 year
Finance Lease, Principal Payments |  | $ 0.0
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year | $ 7.2 | 7.2
Lessee, Operating Lease, Liability, Payments, Due Year Two | 12.4 | 12.4
Lessee, Operating Lease, Liability, Payments, Due Year Three | 10.0 | 10.0
Lessee, Operating Lease, Liability, Payments, Due Year Four | 9.2 | 9.2
Lessee, Operating Lease, Liability, Payments, Due Year Five | 6.9 | 6.9
Lessee, Operating Lease, Liability, Payments, Due after Year Five | 6.5 | 6.5
Lessee, Operating Lease, Liability, Payments, Due | 52.2 | 52.2
Lessee, Operating Lease, Liability, Undiscounted Excess Amount | (5.0) | (5.0)
Operating Leases, Rent Expense | 4.1 | 9.3
Short-term Lease, Cost | 1.2 | 2.6
Operating Lease, Right-of-Use Asset | 46.2 | 46.2
Operating Lease, Liability, Noncurrent | $ 47.2 | $ 47.2
Operating Lease, Weighted Average Remaining Lease Term | 5 years | 5 years
Operating Lease, Weighted Average Discount Rate, Percent | 4.10% | 4.10%
Operating Lease, Payments |  | $ 9.3
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability |  | 4.2
Railcar Leasing and Management Services Group [Member] |  |
Lessee, Lease, Description [Line Items] |  |
Minimum Lease Payments, Sale Leaseback Transactions, Remainder of Fiscal Year | $ 5.2 | 5.2
Minimum Lease Payments, Sale Leaseback Transactions, within Two Years | 9.1 | 9.1
Minimum Lease Payments, Sale Leaseback Transactions, within Three Years | 8.2 | 8.2
Minimum Lease Payments, Sale Leaseback Transactions, within Four Years | 7.5 | 7.5
Minimum Lease Payments, Sale Leaseback Transactions, within Five Years | 5.5 | 5.5
Minimum Lease Payments, Sale Leaseback Transactions, Thereafter | 3.3 | 3.3
Minimum Lease Payments, Sale Leaseback Transactions | $ 38.8 | $ 38.8
Railcar Leasing and Management Services Group [Member] | Minimum |  |
Lessee, Lease, Description [Line Items] |  |
Lessee, Operating Lease, Term of Contract | 1 year | 1 year
Railcar Leasing and Management Services Group [Member] | Maximum |  |
Lessee, Lease, Description [Line Items] |  |
Lessee, Operating Lease, Term of Contract | 40 years | 40 years
Consolidated Subsidiaries, Excluding Leasing [Member] |  |
Lessee, Lease, Description [Line Items] |  |
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year | $ 2.0 | $ 2.0
Lessee, Operating Lease, Liability, Payments, Due Year Two | 3.3 | 3.3
Lessee, Operating Lease, Liability, Payments, Due Year Three | 1.8 | 1.8
Lessee, Operating Lease, Liability, Payments, Due Year Four | 1.7 | 1.7
Lessee, Operating Lease, Liability, Payments, Due Year Five | 1.4 | 1.4
Lessee, Operating Lease, Liability, Payments, Due after Year Five | 3.2 | 3.2
Lessee, Operating Lease, Liability, Payments, Due | $ 13.4 | $ 13.4

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