Commitments and Contingencies Minimum Lease Payments (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2019

Dec. 31, 2018

Leases [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

As of March 31, 2019, minimum future payments, including imputed interest, for long-term operating leases under the scope of ASC 842 are as follows:

Year	Amount
	(in millions)
2019	$	19.5
2020	$	20.3
2021	$	18.1
2022	$	14.1
2023	$	8.9
After 2023	$	0.5
Less: Interest(1)	$	(11.9	)
Present value of lease liabilities(2)	$	69.5

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⁽¹⁾  Calculated using the estimated or stated interest rate for each lease.

⁽²⁾  Of the total present value of lease liabilities, $20.1 million was recorded in "Current operating lease liabilities" and $49.4 million was recorded in "Operating lease liabilities" on the Condensed Consolidated Balance Sheets.

As of December 31, 2018, minimum future contractual payments for long-term operating leases under the scope of ASC 840 are as follows:

Year	Amount
	(in millions)
2019	$	17.4
2020	$	13.8
2021	$	9.1
2022	$	7.4
2023	$	4.5
After 2023	$	—