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Supplemental Cash Flow Information (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
NON-CASH INVESTING AND FINANCING ACTIVITIES
Power plant long-term service agreement		$ 39.5	$ 2.3	$ 0.0
SUPPLEMENTAL CASH FLOW INFORMATION
Interest (net of interest capitalized)	[1]	141.9	145.4	150.8
Income taxes (net of income tax refunds)		(5.9)	(3.4)	0.2
Interest costs capitalized		$ 7.5	$ 4.2	$ 2.4
[1] Net of interest capitalized of $7.5 million, $4.2 million and $2.4 million in 2016, 2015 and 2014, respectively.

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Power Plant Long-Term Service Agreement

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586

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Amount of interest capitalized during the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Allowance for Funds Used during Construction
-URI http://asc.fasb.org/extlink&oid=6504829

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

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The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586

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