Fair Value Measurement (Details) - Fair Value, Recurring - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Carrying amount | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable	$ 39.6	$ 23.4
Forward currency contracts	0.0	0.2
Forward currency contracts	0.2	0.0
Fair value | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable	39.3	23.3
Forward currency contracts	0.0	0.2
Forward currency contracts	0.2	0.0
Unsecured Debt | 2023 Unsecured Notes | Carrying amount | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	789.1	0.0
Unsecured Debt | 2023 Unsecured Notes | Fair value | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	809.5	0.0
Secured Debt | 2023 Secured Notes | Carrying amount | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	542.8	0.0
Secured Debt | 2023 Secured Notes | Fair value | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	547.3	0.0
Senior Notes | 2016 Notes | Carrying amount | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	0.0	496.3
Senior Notes | 2016 Notes | Fair value | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	0.0	491.9
Term Loans | Carrying amount | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	1,790.3	85.2
Term Loans | Fair value | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	$ 1,807.1	$ 85.5