Derivative Instruments and Hedging Activities (Details) € in Millions, £ in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2021 GBP (£)	Mar. 31, 2021 EUR (€)	Sep. 30, 2020 USD ($)
Derivative Instruments Gain (Loss) [Line Items]
Gain (loss) recognized on derivative instruments	$ (6.1)	$ (14.8)
Interest rate swaps
Derivative Instruments Gain (Loss) [Line Items]
Notional Amount of Derivatives		500.0			$ 250.0
Cash Flow Hedging [Member]
Derivative Instruments Gain (Loss) [Line Items]
Notional Amount of Derivatives | €				€ 6.5
Currency Forward Agreements USD to BRL
Derivative Instruments Gain (Loss) [Line Items]
Notional Amount of Derivatives			£ 54.9	€ 10.1
Derivative, Number of Instruments Held	6		6	6
Currency Forward Agreements USD to EUR
Derivative Instruments Gain (Loss) [Line Items]
Notional Amount of Derivatives	$ 2.4			€ 2.8
Derivative, Number of Instruments Held	4		4	4
Currency Forward Agreements GBP to EUR
Derivative Instruments Gain (Loss) [Line Items]
Notional Amount of Derivatives | £			£ 5.6
Derivative, Number of Instruments Held	8		8	8
Interest Expense [Member] | Interest rate swaps
Derivative Instruments Gain (Loss) [Line Items]
Gain (loss) recognized on derivative instruments	$ (1.9)	(1.5)
Sales [Member] | Foreign exchange forward contracts
Derivative Instruments Gain (Loss) [Line Items]
Gain (loss) recognized on derivative instruments	0.0	0.3
Asset Management Income [Member] | Foreign exchange forward contracts
Derivative Instruments Gain (Loss) [Line Items]
Gain (loss) recognized on derivative instruments	$ (4.2)	$ (13.6)