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Comprehensive Income - Summary of the Tax Effects Allocated to Each Component of Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss)    
Pre-Tax $ 29.4 $ 19.2
Tax Benefit (Expense) 0.0 (2.4)
Other comprehensive income 29.4 16.8
Foreign Currency Translation Adjustment    
Accumulated Other Comprehensive Income (Loss)    
Pre-Tax 29.1 12.2
Tax Benefit (Expense) 0.0 0.0
Other comprehensive income 29.1 12.2
Change in net realized and unrealized gain (loss) on derivative securities    
Accumulated Other Comprehensive Income (Loss)    
Pre-Tax 0.3 (0.3)
Tax Benefit (Expense) 0.0 0.0
Other comprehensive income 0.3 (0.3)
Change in net unrealized gain (loss) on investment securities    
Accumulated Other Comprehensive Income (Loss)    
Pre-Tax   7.3
Tax Benefit (Expense)   (2.4)
Other comprehensive income (2.1) [1] $ 4.9
Change in net unrealized gain (loss) on investment securities attributable to noncontrolling interest    
Accumulated Other Comprehensive Income (Loss)    
Pre-Tax 0.0  
Tax Benefit (Expense) 0.0  
Other comprehensive income $ 0.0  
[1] In connection with the Company’s adoption of ASU 2016-01, the unrealized losses on investment securities, which related to the non-controlling interests, were reclassified to Non-controlling interests on the Consolidated Condensed Balance Sheets.