Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Assets:
Cash equivalents	$ 0.8	$ 0.9
Foreign exchange forwards
Assets:
Derivative asset	0.4	3.5
Liabilities:
Derivative Liability	1.6	0.3
Interest rate swap arrangements
Assets:
Derivative asset	73.1	65.7
Cross-currency swap arrangements
Liabilities:
Derivative Liability	16.3	17.1
Quoted prices in active markets for identical assets (level I)
Assets:
Cash equivalents	0.8	0.9
Quoted prices in active markets for identical assets (level I) | Foreign exchange forwards
Assets:
Derivative asset	0.0	0.0
Liabilities:
Derivative Liability	0.0	0.0
Quoted prices in active markets for identical assets (level I) | Interest rate swap arrangements
Assets:
Derivative asset	0.0	0.0
Quoted prices in active markets for identical assets (level I) | Cross-currency swap arrangements
Liabilities:
Derivative Liability	0.0	0.0
Significant other observable inputs (level II)
Assets:
Cash equivalents	0.0	0.0
Significant other observable inputs (level II) | Foreign exchange forwards
Assets:
Derivative asset	0.4	3.5
Liabilities:
Derivative Liability	1.6	0.3
Significant other observable inputs (level II) | Interest rate swap arrangements
Assets:
Derivative asset	73.1	65.7
Significant other observable inputs (level II) | Cross-currency swap arrangements
Liabilities:
Derivative Liability	16.3	17.1
Significant unobservable inputs (level III)
Assets:
Cash equivalents	0.0	0.0
Significant unobservable inputs (level III) | Foreign exchange forwards
Assets:
Derivative asset	0.0	0.0
Liabilities:
Derivative Liability	0.0	0.0
Significant unobservable inputs (level III) | Interest rate swap arrangements
Assets:
Derivative asset	0.0	0.0
Significant unobservable inputs (level III) | Cross-currency swap arrangements
Liabilities:
Derivative Liability	$ 0.0	$ 0.0