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Fair Value Measurements, Recurring and Nonrecurring (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013
ASSETS:
Available-for-sale debt securities, at fair value	$ 4,221.8	$ 4,049.3	$ 3,829.6	$ 3,578.0	$ 3,416.1	$ 3,245.8	$ 3,154.8	$ 3,049.9
Separate account assets	1,757.5us-gaap_SeparateAccountAssets	1,816.3us-gaap_SeparateAccountAssets	1,951.0us-gaap_SeparateAccountAssets	1,979.3us-gaap_SeparateAccountAssets	2,052.7us-gaap_SeparateAccountAssets	2,049.5us-gaap_SeparateAccountAssets	2,021.3us-gaap_SeparateAccountAssets	2,109.5us-gaap_SeparateAccountAssets
U.S. government and agency
ASSETS:
Available-for-sale debt securities, at fair value	89.3				68.6
State and political subdivision
ASSETS:
Available-for-sale debt securities, at fair value	229.2				154.6
Foreign government
ASSETS:
Available-for-sale debt securities, at fair value	73.8				65.5
Corporate
ASSETS:
Available-for-sale debt securities, at fair value	2,831.9				2,196.9
Commercial mortgage-backed (“CMBS”)
ASSETS:
Available-for-sale debt securities, at fair value	255.6				253.7
Residential mortgage-backed (“RMBS”)
ASSETS:
Available-for-sale debt securities, at fair value	576.4				510.0
Collateralized debt obligation (“CDO”) / collateralized loan obligation (“CLO”)
ASSETS:
Available-for-sale debt securities, at fair value	83.5				70.9
Other asset-backed (“ABS”)
ASSETS:
Available-for-sale debt securities, at fair value	82.1				95.9
Nonrecurring
ASSETS:
Available-for-sale debt securities, at fair value	4,221.8				3,416.1
Available-for-sale equity securities	28.7				11.2
Short-term investments	79.8				81.0
Derivative assets	157.5				225.3
Fair value investments	46.7				48.6
Separate account assets	1,757.5				2,052.7
Total assets	6,292.0				5,834.9
Liabilities
Derivative liabilities	85.6				116.1
Embedded derivatives	160.3				87.8
Total liabilities	245.9				203.9
Nonrecurring \| U.S. government and agency
ASSETS:
Available-for-sale debt securities, at fair value	89.3				68.6
Nonrecurring \| State and political subdivision
ASSETS:
Available-for-sale debt securities, at fair value	229.2				154.6
Nonrecurring \| Foreign government
ASSETS:
Available-for-sale debt securities, at fair value	73.8				65.5
Nonrecurring \| Corporate
ASSETS:
Available-for-sale debt securities, at fair value	2,831.9				2,196.9
Nonrecurring \| Commercial mortgage-backed (“CMBS”)
ASSETS:
Available-for-sale debt securities, at fair value	255.6				253.7
Nonrecurring \| Residential mortgage-backed (“RMBS”)
ASSETS:
Available-for-sale debt securities, at fair value	576.4				510.0
Nonrecurring \| Collateralized debt obligation (“CDO”) / collateralized loan obligation (“CLO”)
ASSETS:
Available-for-sale debt securities, at fair value	83.5				70.9
Nonrecurring \| Other asset-backed (“ABS”)
ASSETS:
Available-for-sale debt securities, at fair value	82.1				95.9
Nonrecurring \| Level 1
ASSETS:
Available-for-sale debt securities, at fair value	0				0
Available-for-sale equity securities	0				0
Short-term investments	79.8				80.0
Derivative assets	0				0
Fair value investments	0				0
Separate account assets	1,757.5				2,052.7
Total assets	1,837.3				2,132.7
Liabilities
Derivative liabilities	0.5				5.3
Embedded derivatives	0				0
Total liabilities	0.5				5.3
Nonrecurring \| Level 1 \| U.S. government and agency
ASSETS:
Available-for-sale debt securities, at fair value	0				0
Nonrecurring \| Level 1 \| State and political subdivision
ASSETS:
Available-for-sale debt securities, at fair value	0				0
Nonrecurring \| Level 1 \| Foreign government
ASSETS:
Available-for-sale debt securities, at fair value	0				0
Nonrecurring \| Level 1 \| Corporate
ASSETS:
Available-for-sale debt securities, at fair value	0				0
Nonrecurring \| Level 1 \| Commercial mortgage-backed (“CMBS”)
ASSETS:
Available-for-sale debt securities, at fair value	0				0
Nonrecurring \| Level 1 \| Residential mortgage-backed (“RMBS”)
ASSETS:
Available-for-sale debt securities, at fair value	0				0
Nonrecurring \| Level 1 \| Collateralized debt obligation (“CDO”) / collateralized loan obligation (“CLO”)
ASSETS:
Available-for-sale debt securities, at fair value	0				0
Nonrecurring \| Level 1 \| Other asset-backed (“ABS”)
ASSETS:
Available-for-sale debt securities, at fair value	0				0
Nonrecurring \| Level 2
ASSETS:
Available-for-sale debt securities, at fair value	2,137.4				1,767.1
Available-for-sale equity securities	0				0
Short-term investments	0				1.0
Derivative assets	157.5				225.3
Fair value investments	13.0				13.0
Separate account assets	0				0
Total assets	2,307.9				2,006.4
Liabilities
Derivative liabilities	85.1				110.8
Embedded derivatives	0				0
Total liabilities	85.1				110.8
Nonrecurring \| Level 2 \| U.S. government and agency
ASSETS:
Available-for-sale debt securities, at fair value	9.1				9.8
Nonrecurring \| Level 2 \| State and political subdivision
ASSETS:
Available-for-sale debt securities, at fair value	35.9				20.8
Nonrecurring \| Level 2 \| Foreign government
ASSETS:
Available-for-sale debt securities, at fair value	57.7				62.2
Nonrecurring \| Level 2 \| Corporate
ASSETS:
Available-for-sale debt securities, at fair value	1,414.7				1,105.0
Nonrecurring \| Level 2 \| Commercial mortgage-backed (“CMBS”)
ASSETS:
Available-for-sale debt securities, at fair value	191.0				221.8
Nonrecurring \| Level 2 \| Residential mortgage-backed (“RMBS”)
ASSETS:
Available-for-sale debt securities, at fair value	424.8				333.9
Nonrecurring \| Level 2 \| Collateralized debt obligation (“CDO”) / collateralized loan obligation (“CLO”)
ASSETS:
Available-for-sale debt securities, at fair value	0				0
Nonrecurring \| Level 2 \| Other asset-backed (“ABS”)
ASSETS:
Available-for-sale debt securities, at fair value	4.2				13.6
Nonrecurring \| Level 3
ASSETS:
Available-for-sale debt securities, at fair value	2,084.4				1,649.0
Available-for-sale equity securities	28.7				11.2
Short-term investments	0				0
Derivative assets	0				0
Fair value investments	33.7				35.6
Separate account assets	0				0
Total assets	2,146.8				1,695.8
Liabilities
Derivative liabilities	0				0
Embedded derivatives	160.3				87.8
Total liabilities	160.3				87.8
Nonrecurring \| Level 3 \| U.S. government and agency
ASSETS:
Available-for-sale debt securities, at fair value	80.2				58.8
Nonrecurring \| Level 3 \| State and political subdivision
ASSETS:
Available-for-sale debt securities, at fair value	193.3				133.8
Nonrecurring \| Level 3 \| Foreign government
ASSETS:
Available-for-sale debt securities, at fair value	16.1				3.3
Nonrecurring \| Level 3 \| Corporate
ASSETS:
Available-for-sale debt securities, at fair value	1,417.2				1,091.9
Nonrecurring \| Level 3 \| Commercial mortgage-backed (“CMBS”)
ASSETS:
Available-for-sale debt securities, at fair value	64.6				31.9
Nonrecurring \| Level 3 \| Residential mortgage-backed (“RMBS”)
ASSETS:
Available-for-sale debt securities, at fair value	151.6				176.1
Nonrecurring \| Level 3 \| Collateralized debt obligation (“CDO”) / collateralized loan obligation (“CLO”)
ASSETS:
Available-for-sale debt securities, at fair value	83.5				70.9
Nonrecurring \| Level 3 \| Other asset-backed (“ABS”)
ASSETS:
Available-for-sale debt securities, at fair value	$ 77.9				$ 82.3