Investing Activities - Schedule of Available-for-sale Securities (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Fair Value and Cost of Securities:
Total	$ 4,238.8	$ 4,060.9
Gross Unrealized Gains	250.7	198.8
Gross Unrealized Losses	(31.3)	(37.9)
Fair Value	4,458.2	4,221.8
OTTI Recognized in AOCI	(12.4)	(13.0)
Amortized Cost	28.4	28.4
Gross Unrealized Gains	1.2	0.6
Gross Unrealized Losses	(0.1)	(0.3)
Fair Value	29.5	28.7
OTTI Recognized in AOCI	0	0
U.S. government and agency
Fair Value and Cost of Securities:
Total	82.0	82.4
Gross Unrealized Gains	8.3	6.9
Gross Unrealized Losses	0	0
Fair Value	90.3	89.3
OTTI Recognized in AOCI	0	0
State and political subdivision
Fair Value and Cost of Securities:
Total	227.7	217.2
Gross Unrealized Gains	18.5	13.6
Gross Unrealized Losses	(1.5)	(1.6)
Fair Value	244.7	229.2
OTTI Recognized in AOCI	(0.2)	(0.2)
Foreign government
Fair Value and Cost of Securities:
Total	77.9	69.2
Gross Unrealized Gains	6.8	5.4
Gross Unrealized Losses	(0.3)	(0.8)
Fair Value	84.4	73.8
OTTI Recognized in AOCI	0	0
Corporate
Fair Value and Cost of Securities:
Total	2,930.1	2,730.7
Gross Unrealized Gains	168.2	128.4
Gross Unrealized Losses	(22.6)	(27.2)
Fair Value	3,075.7	2,831.9
OTTI Recognized in AOCI	(1.5)	(1.5)
Commercial mortgage-backed (“CMBS”)
Fair Value and Cost of Securities:
Total	235.5	236.2
Gross Unrealized Gains	22.4	19.4
Gross Unrealized Losses	0	0
Fair Value	257.9	255.6
OTTI Recognized in AOCI	0	0
Residential mortgage-backed (“RMBS”)
Fair Value and Cost of Securities:
Total	502.7	558.9
Gross Unrealized Gains	21.4	20.9
Gross Unrealized Losses	(2.5)	(3.4)
Fair Value	521.6	576.4
OTTI Recognized in AOCI	(8.5)	(8.6)
Collateralized debt obligations (“CDO”) / collateralized loan obligations (“CLO”)
Fair Value and Cost of Securities:
Total	96.1	84.2
Gross Unrealized Gains	1.0	0.4
Gross Unrealized Losses	(0.6)	(1.1)
Fair Value	96.5	83.5
OTTI Recognized in AOCI	(2.2)	(2.7)
Other asset-backed (“ABS”)
Fair Value and Cost of Securities:
Total	86.8	82.1
Gross Unrealized Gains	4.1	3.8
Gross Unrealized Losses	(3.8)	(3.8)
Fair Value	87.1	82.1
OTTI Recognized in AOCI	$ 0	$ 0

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