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Summary of Significant Accounting Policies Lessee Accounting (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2019 USD ($)
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 | $ 4.1 | 4.1
Lessee, Operating Lease, Liability, Payments, Due Year Two | 12.6 | 12.6
Lessee, Operating Lease, Liability, Payments, Due Year Three | 10.3 | 10.3
Lessee, Operating Lease, Liability, Payments, Due Year Four | 9.3 | 9.3
Lessee, Operating Lease, Liability, Payments, Due Year Five | 7.0 | 7.0
Lessee, Operating Lease, Liability, Payments, Due after Year Five | 6.6 | 6.6
Lessee, Operating Lease, Liability, Payments, Due | 49.9 | 49.9
Lessee, Operating Lease, Liability, Undiscounted Excess Amount | (3.9) | (3.9)
Operating Leases, Rent Expense | 4.0 | 13.3
Short-term Lease, Cost | 0.9 | 3.5
Operating Lease, Right-of-Use Asset | 45.3 | 45.3
Operating Lease, Liability, Noncurrent | $ 46.0 | $ 46.0
Operating Lease, Weighted Average Remaining Lease Term | 4 years 10 months 24 days | 4 years 10 months 24 days
Operating Lease, Weighted Average Discount Rate, Percent | 4.10% | 4.10%
Operating Lease, Payments |  | $ 13.3
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability |  | $ 8.4
Minimum |  |
Lessee, Lease, Description [Line Items] |  |
Lessee, Operating Lease, Term of Contract | 1 year | 1 year
Maximum |  |
Lessee, Lease, Description [Line Items] |  |
Lessee, Operating Lease, Term of Contract | 40 years | 40 years
Railcar Leasing and Management Services Group [Member] |  |
Lessee, Lease, Description [Line Items] |  |
Minimum Lease Payments, Sale Leaseback Transactions, Remainder of Fiscal Year | $ 3.2 | $ 3.2
Minimum Lease Payments, Sale Leaseback Transactions, within Two Years | 9.5 | 9.5
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 | 37.2 | 37.2
Consolidated Subsidiaries, Excluding Leasing [Member] |  |
Lessee, Lease, Description [Line Items] |  |
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year | 0.9 | 0.9
Lessee, Operating Lease, Liability, Payments, Due Year Two | 3.1 | 3.1
Lessee, Operating Lease, Liability, Payments, Due Year Three | 2.1 | 2.1
Lessee, Operating Lease, Liability, Payments, Due Year Four | 1.8 | 1.8
Lessee, Operating Lease, Liability, Payments, Due Year Five | 1.5 | 1.5
Lessee, Operating Lease, Liability, Payments, Due after Year Five | 3.3 | 3.3
Lessee, Operating Lease, Liability, Payments, Due | $ 12.7 | $ 12.7

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