Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 4D
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset.

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Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as a liability.

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Derivative Instruments and Hedging Activities Fair Value Balance Sheet (Details) CAD in Millions, $ in Millions	Dec. 31, 2016 USD ($)	Jul. 07, 2016 CAD	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Jan. 03, 2014 CAD
Derivatives not designated as hedging instruments:
Notional amount of derivative, not designated as hedging instrument				$ 300.0
Interest rate swaps
Derivatives not designated as hedging instruments:
Notional amount of derivative, not designated as hedging instrument					$ 500.0
Foreign currency forwards
Derivatives not designated as hedging instruments:
Notional amount of derivative, not designated as hedging instrument \| CAD		CAD 965.5
Designated as Hedging Instrument
Derivatives designated as hedging instruments:
Derivative asset, fair value, designated as hedging instrument	$ 15.3		$ 44.1
Derivative liability, fair value, designated as hedging instrument	(0.9)		0.0
Designated as Hedging Instrument \| Foreign currency forwards
Derivatives not designated as hedging instruments:
Notional amount of derivative, not designated as hedging instrument			300.3
Designated as Hedging Instrument \| Foreign currency forwards \| Other current assets
Derivatives designated as hedging instruments:
Derivative asset, fair value, designated as hedging instrument	12.0		28.4
Designated as Hedging Instrument \| Foreign currency forwards \| Accounts payable and accrued liabilities
Derivatives designated as hedging instruments:
Derivative liability, fair value, designated as hedging instrument	(0.3)		0.0
Designated as Hedging Instrument \| Foreign currency forwards \| Other Liabilities
Derivatives designated as hedging instruments:
Derivative liability, fair value, designated as hedging instrument	(0.6)		0.0
Designated as Hedging Instrument \| Foreign currency forwards \| Other assets
Derivatives designated as hedging instruments:
Derivative asset, fair value, designated as hedging instrument	3.3		15.7
Not Designated as Hedging Instrument
Derivatives not designated as hedging instruments:
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	(24.4)		(0.6)
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	(42.5)		(22.0)
Not Designated as Hedging Instrument \| Commodity swaps
Derivatives not designated as hedging instruments:
Notional amount of derivative, not designated as hedging instrument	791.4		120.3
Not Designated as Hedging Instrument \| Commodity swaps \| Other current assets
Derivatives not designated as hedging instruments:
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	(11.8)		(0.4)
Not Designated as Hedging Instrument \| Commodity swaps \| Accounts payable and accrued liabilities
Derivatives not designated as hedging instruments:
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	(23.3)		(12.5)
Not Designated as Hedging Instrument \| Commodity swaps \| Other Liabilities
Derivatives not designated as hedging instruments:
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	(19.2)		(9.5)
Not Designated as Hedging Instrument \| Commodity swaps \| Other assets
Derivatives not designated as hedging instruments:
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	(12.6)
Not Designated as Hedging Instrument \| Commodity swaps \| Other Noncurrent Assets
Derivatives not designated as hedging instruments:
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value			$ (0.2)
Not Designated as Hedging Instrument \| Commodity Option [Member]
Derivatives not designated as hedging instruments:
Notional amount of derivative, not designated as hedging instrument	13.6
Not Designated as Hedging Instrument \| Commodity Option [Member] \| Other Liabilities
Derivatives not designated as hedging instruments:
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	0.0
Not Designated as Hedging Instrument \| Commodity Option [Member] \| Other assets
Derivatives not designated as hedging instruments:
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	0.0
Cash Flow Hedges \| Cross currency swaps
Derivatives not designated as hedging instruments:
Notional amount of derivative, not designated as hedging instrument \| CAD						CAD 241.0
Cash Flow Hedges \| Designated as Hedging Instrument \| Foreign currency forwards
Derivatives not designated as hedging instruments:
Notional amount of derivative, not designated as hedging instrument	$ 329.4