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Changes in Accumulated Other Comprehensive Loss (Schedule of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance, beginning $ 1,608.2    
Other comprehensive income (loss) prior to reclassifications (7.7) $ 11.0  
Amounts reclassified from accumulated other comprehensive loss (0.2) (11.8)  
Net current period other comprehensive loss (7.9) (0.8) $ 5.9
Balance, ending 1,823.2 1,608.2  
Foreign currency translation adjustments 0.2 0.0  
Accumulated Translation Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance, beginning (42.2) (42.5)  
Other comprehensive income (loss) prior to reclassifications (8.0) 0.3  
Amounts reclassified from accumulated other comprehensive loss 0.0 0.0  
Net current period other comprehensive loss (8.0) 0.3  
Balance, ending (50.2) (42.2) (42.5)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance, beginning (0.1) (3.5)  
Other comprehensive income (loss) prior to reclassifications 0.3 11.1  
Amounts reclassified from accumulated other comprehensive loss (0.2) (7.7)  
Net current period other comprehensive loss 0.1 3.4  
Balance, ending 0.0 (0.1) (3.5)
Accumulated Net Unrealized Investment Gain (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance, beginning 0.0 4.5  
Other comprehensive income (loss) prior to reclassifications 0.0 (0.4)  
Amounts reclassified from accumulated other comprehensive loss 0.0 (4.1)  
Net current period other comprehensive loss 0.0 (4.5)  
Balance, ending 0.0 0.0 4.5
Accumulated Other Comprehensive Loss [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance, beginning (42.3) (41.5)  
Balance, ending $ (50.2) $ (42.3) $ (41.5)