Commitments and Contingencies Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2019

Commitments and Contingencies Disclosure [Abstract]

Schedule of Operating and Finance Lease Right-of-Use Assets

Operating lease ROU assets:

(Millions of Dollars)	Sept. 30, 2019
PPAs	$	585.1
Other	68.7
Gross operating lease ROU assets	653.8
Accumulated amortization	(59.4		)
Net operating lease ROU assets	$	594.4

Finance lease ROU assets:

(Millions of Dollars)	Sept. 30, 2019
Gas storage facilities	$	200.5
Gas pipeline	20.7
Gross finance lease ROU assets	221.2
Accumulated amortization	(80.8		)
Net finance lease ROU assets	$	140.4

Schedule of Components of Lease Expense

Components of lease expense:

(Millions of Dollars)	Three Months Ended Sept. 30, 2019		Nine Months Ended Sept. 30, 2019
Operating leases
PPA capacity payments	$	24.6	$	73.6
Other operating leases (a)	4.3		11.5
Total operating lease expense (b)	$	28.9	$	85.1
Finance leases
Amortization of ROU assets	$	1.6	$	4.6
Interest expense on lease liability	4.7		14.2
Total finance lease expense	$	6.3	$	18.8

^(a)  Includes short-term lease expense of $0.3 million for the three months ended Sept. 30, 2019 and $1.0 million for the nine months ended Sept. 30, 2019.

^(b) 

PPA capacity payments are included in electric fuel and purchased power on the consolidated statements of income. Expense for other operating leases is included in O&M expense and electric fuel and purchased power.

Schedule of Future Commitments under Finance Leases

Future commitments under operating and finance leases as of Sept. 30, 2019:

(Millions of Dollars)	PPA (a) (b) Operating Leases			Other Operating Leases			Total Operating Leases			Finance Leases
2019	$	23.9		$	3.3		$	27.2		$	6.2
2020	95.9			13.2			109.1			24.8
2021	96.4			12.6			109.0			23.6
2022	82.6			11.6			94.2			20.5
2023	70.0			10.9			80.9			20.3
Thereafter	288.6			29.2			317.8			419.8
Total minimum obligation	657.4			80.8			738.2			515.2
Interest component of obligation	(100.6		)	(13.1		)	(113.7		)	(374.8		)
Present value of minimum obligation	$	556.8		$	67.7		624.5			140.4
Less current portion							(85.0		)	(6.7		)
Noncurrent operating and finance lease liabilities							$	539.5		$	133.7
Weighted-average remaining lease term in years							8.1			38.9

^(a)  Amounts do not include PPAs accounted for as executory contracts and/or contingent payments, such as energy payments on renewable PPAs.

^(b)  PPA operating leases contractually expire at various dates through 2032.

Future commitments under operating and finance leases as of Dec. 31, 2018:

(Millions of Dollars)	PPA (a) (b) Operating Leases		Other Operating Leases		Total Operating Leases		Finance Leases
2019	$	95.5	$	10.8	$	106.3	$	24.9
2020	95.9		10.7		106.6		24.8
2021	96.4		9.5		105.9		23.6
2022	82.6		8.4		91.0		20.5
2023	70.0		8.1		78.1		20.3
Thereafter	288.6		53.4		342.0		420.4
Total minimum obligation							534.5
Interest component of obligation							(389.5		)
Present value of minimum obligation							$	145.0

^(a)  Amounts do not include PPAs accounted for as executory contracts and/or contingent payments, such as energy payments on renewable PPAs.

^(b) 

PPA operating leases contractually expire at various dates through 2032.

Schedule of Future Commitments under Operating Leases

Future commitments under operating and finance leases as of Sept. 30, 2019:

(Millions of Dollars)	PPA (a) (b) Operating Leases			Other Operating Leases			Total Operating Leases			Finance Leases
2019	$	23.9		$	3.3		$	27.2		$	6.2
2020	95.9			13.2			109.1			24.8
2021	96.4			12.6			109.0			23.6
2022	82.6			11.6			94.2			20.5
2023	70.0			10.9			80.9			20.3
Thereafter	288.6			29.2			317.8			419.8
Total minimum obligation	657.4			80.8			738.2			515.2
Interest component of obligation	(100.6		)	(13.1		)	(113.7		)	(374.8		)
Present value of minimum obligation	$	556.8		$	67.7		624.5			140.4
Less current portion							(85.0		)	(6.7		)
Noncurrent operating and finance lease liabilities							$	539.5		$	133.7
Weighted-average remaining lease term in years							8.1			38.9

^(a)  Amounts do not include PPAs accounted for as executory contracts and/or contingent payments, such as energy payments on renewable PPAs.

^(b)  PPA operating leases contractually expire at various dates through 2032.

Future commitments under operating and finance leases as of Dec. 31, 2018:

(Millions of Dollars)	PPA (a) (b) Operating Leases		Other Operating Leases		Total Operating Leases		Finance Leases
2019	$	95.5	$	10.8	$	106.3	$	24.9
2020	95.9		10.7		106.6		24.8
2021	96.4		9.5		105.9		23.6
2022	82.6		8.4		91.0		20.5
2023	70.0		8.1		78.1		20.3
Thereafter	288.6		53.4		342.0		420.4
Total minimum obligation							534.5
Interest component of obligation							(389.5		)
Present value of minimum obligation							$	145.0

^(a)  Amounts do not include PPAs accounted for as executory contracts and/or contingent payments, such as energy payments on renewable PPAs.

^(b) 

PPA operating leases contractually expire at various dates through 2032.