Accumulated Other Comprehensive Income (Loss) - Changes in AOCI, including Reclassification Adjustments (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Available-for-sale securities, Before-Tax Amount:
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	$ 2.1	$ 2.9	$ 22.8	$ 50.5
DAC/VOBA and Sales inducements	(9.2)	(36.7)	(135.1)	(449.0)
Premium deficiency reserve adjustment	(6.4)	(15.3)	(27.4)	(60.8)
Change in unrealized gains/losses on available-for-sale securities	91.5	45.7	408.7	1,004.4
Available-for-sale securities, Income Tax:
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	(0.8)	(1.0)	(8.0)	(17.7)
DAC/VOBA and Sales inducements	3.3	12.9	47.3	157.2
Premium deficiency reserve adjustment	2.2	5.4	9.6	21.3
Change in unrealized gains/losses on available-for-sale securities	(31.7)	(19.1)	(141.6)	(349.4)
Available-for-sale securities, After-Tax Amount:
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	1.3	1.9	14.8	32.8
DAC/VOBA and Sales inducements	(5.9)	(23.8)	(87.8)	(291.8)
Premium deficiency reserve adjustment	(4.2)	(9.9)	(17.8)	(39.5)
Change in unrealized gains/losses on available-for-sale securities	59.8	26.6	267.1	655.0
OTTI:
Other-than-temporary impairments	0.1	0.4	1.9	1.2
OTTI	(0.1)	(0.1)	(0.7)	(0.4)
OTTI	0.0	0.3	1.2	0.8
Derivatives, Before-Tax Amount:
Derivatives	(16.3)	(2.8)	(35.6)	12.9
Adjustments related to effective cash flow hedges for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	(5.9)	(5.0)	(17.5)	(13.7)
Change in unrealized gains/losses on derivatives	(22.2)	(7.8)	(53.1)	(0.8)
Derivatives, Income Tax:
Derivatives	5.6	1.0	12.4	(4.5)
Adjustments related to effective cash flow hedges for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	2.0	1.8	6.1	4.8
Change in unrealized gains/losses on derivatives	7.6	2.8	18.5	0.3
Derivatives, After-Tax Amount:
Derivatives	(10.7)	(1.8)	(23.2)	8.4
Adjustments related to effective cash flow hedges for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	(3.9)	(3.2)	(11.4)	(8.9)
Change in unrealized gains/losses on derivatives	(14.6)	(5.0)	(34.6)	(0.5)
Pension and other post-employment benefit liability, Before-Tax Amount:
Amortization of prior service cost recognized in Operating expenses in the Condensed Consolidated Statements of Operations	(0.6)	(0.5)	(1.7)	(1.6)
Change in pension and other postretirement benefits liability	(0.6)	(0.5)	(1.7)	(1.6)
Other comprehensive income (loss), before tax	68.7	37.4	353.9	1,002.0
Pension and other post-employment benefit liability, Income Tax:
Amortization of prior service cost recognized in Operating expenses in the Condensed Consolidated Statements of Operations	0.2	0.2	0.6	0.6
Change in pension and other postretirement benefits liability	0.2	0.2	0.6	0.6
Change in Other comprehensive income (loss)	(23.9)	(16.1)	(122.5)	(348.5)
Pension and other post-employment benefit liability, After-Tax Amount:
Amortization of prior service cost recognized in Operating expenses in the Condensed Consolidated Statements of Operations	(0.4)	(0.3)	(1.1)	(1.0)
Change in pension and other postretirement benefits liability	(0.4)	(0.3)	(1.1)	(1.0)
Other comprehensive income (loss), after tax	44.8	21.3	231.4	653.5
Fixed maturities
Available-for-sale securities, Before-Tax Amount:
Fixed maturities	105.0	93.6	545.9	1,460.5
Available-for-sale securities, Income Tax:
Fixed maturities	(36.3)	(36.0)	(189.6)	(509.1)
Available-for-sale securities, After-Tax Amount:
Fixed maturities	68.7	57.6	356.3	951.4
Equity securities
Available-for-sale securities, Before-Tax Amount:
Fixed maturities	(0.1)	0.8	0.6	2.0
Available-for-sale securities, Income Tax:
Fixed maturities	0.0	(0.3)	(0.2)	(0.7)
Available-for-sale securities, After-Tax Amount:
Fixed maturities	$ (0.1)	$ 0.5	$ 0.4	$ 1.3

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