Hedging Activities, Derivative Instruments and Credit Risk - Cash Flow Hedges included in Accumulated Other Comprehensive Income (Loss) (Details) - Interest rate swap contracts - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Gains and Losses on Derivatives Designated as Cash Flow Hedges [Abstract]
Gain recognized in OCI on derivatives	$ 1.6	$ 10.5	$ 18.3
Gain (loss) reclassified from AOCI into income (effective portion)	$ 15.7	$ 15.6	$ (2.8)

Amount, after tax and before reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-11

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 10A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration