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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
(in millions)Investment SecuritiesDefined Benefit PlansDerivative InvestmentsForeign Currency TranslationTotal
Balance at December 31, 2022$(0.9)$(22.8)$64.7 $(174.3)$(133.3)
Other comprehensive income before reclassifications and income tax benefit (expense)0.6 (0.9)— 70.8 70.5 
Reclassification adjustment for loss included in net income— — — 9.7 9.7 
Amounts reclassified from accumulated other comprehensive income— 0.1 (3.6)— (3.5)
Income tax benefit (expense)(0.1)0.2 0.9 — 1.0 
Net current period other comprehensive income 0.5 (0.6)(2.7)80.5 77.7 
Balance at December 31, 2023$(0.4)$(23.4)$62.0 $(93.8)$(55.6)
(in millions)Investment SecuritiesDefined Benefit PlansDerivative InvestmentsForeign Currency TranslationTotal
Balance at December 31, 2021$1.1 $(34.8)$66.1 $21.1 $53.5 
Other comprehensive income before reclassifications and income tax benefit (expense)(2.7)14.9 — (195.4)(183.2)
Amounts reclassified from accumulated other comprehensive income— 1.2 (1.9)— (0.7)
Income tax benefit (expense)0.7 (4.1)0.5 — (2.9)
Net current period other comprehensive income(2.0)12.0 (1.4)(195.4)(186.8)
Balance at December 31, 2022$(0.9)$(22.8)$64.7 $(174.3)$(133.3)
(in millions)Investment SecuritiesDefined Benefit PlansDerivative InvestmentsForeign Currency TranslationTotal
Balance at December 31, 2020$1.6 $(57.1)$67.0 $123.4 $134.9 
Other comprehensive income before reclassifications and income tax benefit (expense)(1.0)25.5 — (62.0)(37.5)
Amounts reclassified from accumulated other comprehensive income0.3 4.4 (1.2)(40.3)(36.8)
Income tax benefit (expense)0.2 (7.6)0.3 — (7.1)
Net current period other comprehensive income(0.5)22.3 (0.9)(102.3)(81.4)
Balance at December 31, 2021$1.1 $(34.8)$66.1 $21.1 $53.5