Commitments and Contingencies Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Total costs of products/services sold	$ 3,843.9	$ 1,600.5	$ 2,544.9
2022	14.6
Operating cash flows from operating leases	19.0	21.3	22.9
Operating leases	0.0	2.1	4.2
Operations and maintenance	121.0	131.8	138.8
Operating lease expense	$ 20.0	$ 27.2	28.3
Operating lease, weighted average remaining lease term	3 years 10 months 24 days	4 years 3 months 18 days
Operating lease right-of-use assets, net	$ 27.4	$ 36.8
Accrued expenses and other liabilities	147.1	122.0
Operating leases	19.4	28.5
Total operating lease liabilities	32.6	43.2
Property, plant and equipment	3,771.5	3,759.6
Less: accumulated depreciation	992.1	842.5
Property, plant and equipment, net	2,779.4	2,917.1
Other long-term liabilities	258.7	253.3
Total finance lease liabilities	$ 2.9	$ 4.8
Finance Lease, Weighted Average Remaining Lease Term	2 years 7 months 6 days	1 year 8 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent	5.90%	6.20%
Finance Lease, Weighted Average Discount Rate, Percent	5.50%	7.30%
Lease income	$ (3.7)	$ (1.7)	(1.0)
Operating Lease Expense, Net	16.3	25.5	27.3
Amortization of right-of-use assets	3.0	3.5	3.6
Interest on lease liabilities	0.3	0.5	0.7
Finance Lease Expense	3.3	4.0	4.3
Operating cash flows from finance leases	0.3	0.5	0.7
Payments on finance leases	2.8	3.1	3.5
Finance leases	1.5	$ 0.4	$ 1.8
2022	1.8
2022	16.4
2023	7.5
2023	0.5
2023	8.0
2024	6.6
2024	0.3
2024	6.9
2025	3.2
2025	0.3
2025	3.5
2026	3.0
2026	0.2
2026	3.2
Thereafter	2.0
Thereafter	0.0
Thereafter	2.0
Total lease payments	36.9
Total lease payments	3.1
Total lease payments	40.0
Less: interest	4.3
Less: interest	0.2
Less: interest	4.5
Present value of lease liabilities	$ 35.5
Minimum
Lessee, Lease, Description [Line Items]
Renewal term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Renewal term	10 years