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Reclassifications from Accumulated Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income Reclassification (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Available for sale securities:    
Income from operations before income tax $ 6.2 $ 34.4
General, administrative and corporate expenses 137.3 121.0
Income tax benefit/(expense) 4.4 (3.6)
Net income 10.6 30.8
Reclassification out of AOCI    
Available for sale securities:    
Net income 0.1 1.4
Reclassification out of AOCI | Available for sale securities    
Available for sale securities:    
Realized gains on sale of securities 3.0 2.0
Realized (losses) on sale of securities (3.2) (1.9)
Income from operations before income tax (0.2) 0.1
Income tax benefit/(expense) 0.0 (0.1)
Net income (0.2) 0.0
Reclassification out of AOCI | Realized derivatives    
Available for sale securities:    
General, administrative and corporate expenses 0.4 1.7
Income tax benefit/(expense) (0.1) (0.3)
Net income $ 0.3 $ 1.4