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Comprehensive Income - Schedule of components of accumulated other comprehensive income, net of taxes (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) Net of Tax [Roll Forward]  
Beginning balance $ 81.3
Other comprehensive income before reclassifications (5.3)
Amounts reclassified from other comprehensive income (1.8)
Net other comprehensive income (7.1)
Ending balance 74.2
Foreign Currency Translation Adjustment [Member]
  
Accumulated Other Comprehensive Income (Loss) Net of Tax [Roll Forward]  
Beginning balance 76.2
Other comprehensive income before reclassifications (19.6)
Amounts reclassified from other comprehensive income 0
Net other comprehensive income (19.6)
Ending balance 56.6
Realized and Unrealized Losses on Derivative Securities [Member]
  
Accumulated Other Comprehensive Income (Loss) Net of Tax [Roll Forward]  
Beginning balance (2.9)
Other comprehensive income before reclassifications 1.0
Amounts reclassified from other comprehensive income 0
Net other comprehensive income 1.0
Ending balance (1.9)
Unrealized Gain (Loss) on Investment Securities [Member]
  
Accumulated Other Comprehensive Income (Loss) Net of Tax [Roll Forward]  
Beginning balance 8.0
Other comprehensive income before reclassifications 13.3
Amounts reclassified from other comprehensive income (1.8)
Net other comprehensive income 11.5
Ending balance $ 19.5