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Derivatives and Hedging Activities - Pre-tax Effect of Derivatives on AOCI and Statement of Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Amortization of accumulated OCI related	$ 5.4		$ 8.6
Derivatives not designated as hedging instruments | Other income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Gain recognized in income	0.0	$ 0.0	0.2	$ 0.0
Derivatives in cash flow hedging relationships
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Loss recognized in OCI (effective portion)	0.1	2.3	5.0	29.2
Derivatives in cash flow hedging relationships | Interest expense, net
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Gain recognized in income	$ 6.6	$ 5.6	$ 18.1	$ 14.6

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 20
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=121577181&loc=SL110061190-113977

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount, before tax, of reclassification from accumulated other comprehensive income (AOCI) for gain (loss) from discontinuance of cash flow hedge included in assessment of hedge effectiveness.

+ References

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