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Derivative Instruments and Hedging Activities, Pro Forma Impact - Offsetting Collateral (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Derivative Asset [Abstract]
Gross collateral	$ 29.8	$ (4.9)
Counterparties with Offsetting Positions or Collateral [Member]
Derivative Asset [Abstract]
Gross collateral	29.8	(4.9)
Current Assets from Risk Management Activities [Member]
Derivative Asset [Abstract]
Gross collateral	29.8	(4.9)
Current Assets from Risk Management Activities [Member] | Counterparties with Offsetting Positions or Collateral [Member]
Derivative Asset [Abstract]
Gross collateral	$ 29.8	$ (4.9)

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- Definition

Derivative collateral obligation (right) to return (reclaim) securities.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_OtherCurrentAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: