Fair Value Measurements and the Fair Value Option - Derivatives Financial Instruments (Details) € in Millions, £ in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 EUR (€)	Jun. 30, 2022 USD ($)	Jun. 30, 2022 GBP (£)
Derivative [Line Items]
Interest Expense	$ 53.2	$ 44.5	$ 103.7	$ 96.1
Foreign Currency Translation
Derivative [Line Items]
Deferred taxes on unrealized losses (gains), arising during the period			2.2
Unrealized (losses) gains, arising during the period			(90.5)
Foreign Currency Translation | Euro
Derivative [Line Items]
Percentage of asset carrying values hedged (as percent)					93.00%	93.00%	93.00%
Foreign Currency Translation | Gibraltar, Pounds
Derivative [Line Items]
Percentage of asset carrying values hedged (as percent)					88.00%	88.00%	88.00%
Currency Derivative Contracts | Foreign Currency Derivative Contracts
Derivative [Line Items]
Deferred taxes on unrealized losses (gains), arising during the period			(13.5)
Unrealized (losses) gains, arising during the period			43.6
Designated as Hedging Instrument | Currency Derivative Contracts | Level 2
Derivative [Line Items]
Hedge Asset						$ 75.1
Hedge Liability						0.2
OCI Gains (Losses)			43.7
Income Statement Gains			18.8
Cash Paid			14.1
Designated as Hedging Instrument | Currency Derivative Contracts | Level 2 | Interest Expense
Derivative [Line Items]
Interest Expense			4.5
Designated as Hedging Instrument | Derivatives Outstanding | Level 2
Derivative [Line Items]
Hedge Asset						75.1
Hedge Liability						0.2
OCI Gains (Losses)			36.5
Income Statement Gains			16.9
Cash Paid			0.0
Designated as Hedging Instrument | Derivatives Outstanding | Level 2 | Interest Expense
Derivative [Line Items]
Interest Expense			4.0
Designated as Hedging Instrument | Foreign Exchange Contract, One
Derivative [Line Items]
Notional | €					€ 262.5
Designated as Hedging Instrument | Foreign Exchange Contract, One | Level 2
Derivative [Line Items]
Hedge Asset						22.6
Hedge Liability						0.2
OCI Gains (Losses)			0.5
Income Statement Gains			15.8
Cash Paid			0.0
Designated as Hedging Instrument | Foreign Exchange Contract, One | Level 2 | Interest Expense
Derivative [Line Items]
Interest Expense			2.1
Designated as Hedging Instrument | Foreign Exchange Contract, Two | KWE
Derivative [Line Items]
Notional | €					40.0
Designated as Hedging Instrument | Foreign Exchange Contract, Two | Level 2 | KWE
Derivative [Line Items]
Hedge Asset						1.0
Hedge Liability						0.0
OCI Gains (Losses)			1.0
Income Statement Gains			0.0
Cash Paid			0.0
Designated as Hedging Instrument | Foreign Exchange Contract, Two | Level 2 | KWE | Interest Expense
Derivative [Line Items]
Interest Expense			0.0
Designated as Hedging Instrument | Foreign Exchange Contract, Three | KWE
Derivative [Line Items]
Notional | €
Designated as Hedging Instrument | Foreign Exchange Contract, Three | Level 2 | KWE
Derivative [Line Items]
Hedge Asset						0.0
Hedge Liability						0.0
OCI Gains (Losses)			(13.6)
Income Statement Gains			0.0
Cash Paid			0.0
Designated as Hedging Instrument | Foreign Exchange Contract, Three | Level 2 | KWE | Interest Expense
Derivative [Line Items]
Interest Expense			0.0
Designated as Hedging Instrument | Foreign Exchange Contract, Four
Derivative [Line Items]
Notional | £							£ 535.0
Designated as Hedging Instrument | Foreign Exchange Contract, Four | Level 2
Derivative [Line Items]
Hedge Asset						51.5
Hedge Liability						0.0
OCI Gains (Losses)			48.6
Income Statement Gains			1.1
Cash Paid			0.0
Designated as Hedging Instrument | Foreign Exchange Contract, Four | Level 2 | Interest Expense
Derivative [Line Items]
Interest Expense			1.9
Designated as Hedging Instrument | Derivative Settled | Level 2
Derivative [Line Items]
Hedge Asset						0.0
Hedge Liability						0.0
OCI Gains (Losses)			7.2
Income Statement Gains			1.9
Cash Paid			14.1
Designated as Hedging Instrument | Derivative Settled | Level 2 | Interest Expense
Derivative [Line Items]
Interest Expense			0.5
Designated as Hedging Instrument | Foreign Exchange Contract, Seven | Level 2
Derivative [Line Items]
Hedge Asset						0.0
Hedge Liability						0.0
OCI Gains (Losses)			0.0
Income Statement Gains			1.9
Cash Paid			1.7
Designated as Hedging Instrument | Foreign Exchange Contract, Seven | Level 2 | Interest Expense
Derivative [Line Items]
Interest Expense			0.3
Designated as Hedging Instrument | Foreign Exchange Contract, Six | Level 2
Derivative [Line Items]
Hedge Asset						0.0
Hedge Liability						$ 0.0
OCI Gains (Losses)			7.2
Income Statement Gains			0.0
Cash Paid			12.4
Designated as Hedging Instrument | Foreign Exchange Contract, Six | Level 2 | Interest Expense
Derivative [Line Items]
Interest Expense			$ 0.2