Fair Value Measurements (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Fair Value Assets And Liabilities Measured On Recurring Basis Financial Statement Captions [Line Items]
Long-term Debt	$ 4,231.0	$ 3,878.1
Debt Instrument, Fair Value Disclosure	4,472.5	4,037.3
Carrying amount and estimated fair value of long term debt
Long-term Debt, Carrying Amount	4,231.0	3,878.1
Long-term Debt, Fair Value	4,472.5	4,037.3
Senior Unsecured Notes Due 2028 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Financial Statement Captions [Line Items]
Long-term Debt	697.3	696.6
Debt Instrument, Fair Value Disclosure	661.7	616.8
Carrying amount and estimated fair value of long term debt
Long-term Debt, Carrying Amount	697.3	696.6
Long-term Debt, Fair Value	661.7	616.8
Senior Secured Notes Due 2026 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Financial Statement Captions [Line Items]
Long-term Debt	299.5	299.1
Debt Instrument, Fair Value Disclosure	292.4	288.0
Carrying amount and estimated fair value of long term debt
Long-term Debt, Carrying Amount	299.5	299.1
Long-term Debt, Fair Value	292.4	288.0
Secured Debt Term B [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Financial Statement Captions [Line Items]
Long-term Debt	570.1	571.0
Debt Instrument, Fair Value Disclosure	577.6	573.1
Carrying amount and estimated fair value of long term debt
Long-term Debt, Carrying Amount	570.1	571.0
Long-term Debt, Fair Value	577.6	573.1
Senior Secured Notes Due 2025
Fair Value Assets And Liabilities Measured On Recurring Basis Financial Statement Captions [Line Items]
Long-term Debt	20.8	20.8
Debt Instrument, Fair Value Disclosure	20.5	20.7
Carrying amount and estimated fair value of long term debt
Long-term Debt, Carrying Amount	20.8	20.8
Long-term Debt, Fair Value	20.5	20.7
Senior secured first lien notes due 2029
Fair Value Assets And Liabilities Measured On Recurring Basis Financial Statement Captions [Line Items]
Long-term Debt	889.9	888.4
Debt Instrument, Fair Value Disclosure	953.1	973.0
Carrying amount and estimated fair value of long term debt
Long-term Debt, Carrying Amount	889.9	888.4
Long-term Debt, Fair Value	953.1	973.0
Exchangeable Notes Due 2028
Fair Value Assets And Liabilities Measured On Recurring Basis Financial Statement Captions [Line Items]
Long-term Debt	223.6	222.2
Debt Instrument, Fair Value Disclosure	310.4	292.6
Carrying amount and estimated fair value of long term debt
Long-term Debt, Carrying Amount	223.6	222.2
Long-term Debt, Fair Value	310.4	292.6
Senior Secured Second Lien Notes due 2030
Fair Value Assets And Liabilities Measured On Recurring Basis Financial Statement Captions [Line Items]
Long-term Debt	1,181.9	1,180.0
Debt Instrument, Fair Value Disclosure	1,308.9	1,273.1
Carrying amount and estimated fair value of long term debt
Long-term Debt, Carrying Amount	1,181.9	1,180.0
Long-term Debt, Fair Value	1,308.9	$ 1,273.1
Delayed-Draw Bridge Credit Agreement
Fair Value Assets And Liabilities Measured On Recurring Basis Financial Statement Captions [Line Items]
Long-term Debt	347.9
Debt Instrument, Fair Value Disclosure	347.9
Carrying amount and estimated fair value of long term debt
Long-term Debt, Carrying Amount	347.9
Long-term Debt, Fair Value	$ 347.9