Accumulated Other Comprehensive Income (Loss) - Changes in AOCI, including Reclassification Adjustments (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Available-for-sale securities, Before-Tax Amount:
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	$ 2.9	$ 26.1	$ 50.5	$ 36.8
DAC/VOBA and sales inducements	(36.7)	44.0	(449.0)	224.4
Premium deficiency reserve adjustment	(15.3)	8.4	(60.8)	43.4
Unrealized gains/losses on securities	45.7	(58.3)	1,004.4	(429.4)
Available-for-sale securities, Income Tax:
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	(1.0)	(9.2)	(17.7)	(12.9)
DAC/VOBA and sales inducements	12.9	(15.4)	157.2	(78.5)
Premium deficiency reserve adjustment	5.4	(2.9)	21.3	(15.2)
Change in unrealized gains/losses on available-for-sale securities	(19.1)	20.0	(349.4)	148.1
Available-for-sale securities, After-Tax Amount:
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	1.9	16.9	32.8	23.9
DAC/VOBA and sales inducements	(23.8)	28.6	(291.8)	145.9
Premium deficiency reserve adjustment	(9.9)	5.5	(39.5)	28.2
Change in unrealized gains/losses on available-for-sale securities	26.6	(38.3)	655.0	(281.3)
OTTI:
Other-than-temporary impairments	0.4	0.6	1.2	2.3
Change in OTTI, Income Tax	(0.1)	(0.2)	(0.4)	(0.8)
Change in OTTI, After-Tax Amount	0.3	0.4	0.8	1.5
Derivatives, Before-Tax Amount:
Change in unrealized capital gains/losses arising during the period, Before-Tax Amount	(2.8)	17.3	12.9	22.6
Adjustments for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	(5.0)	(3.3)	(13.7)	(10.2)
Change in unrealized gains/losses on derivatives	(7.8)	14.0	(0.8)	12.4
Derivatives, Income Tax:
Change in unrealized capital gains/losses arising during the period, Income Tax	1.0	(6.0)	(4.5)	(7.9)
Adjustments for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	1.8	1.2	4.8	3.6
Change in unrealized gains/losses on derivatives	2.8	(4.8)	0.3	(4.3)
Derivatives, After-Tax Amount:
Change in unrealized capital gains/losses arising during the period, After-Tax Amount	(1.8)	11.3	8.4	14.7
Adjustments for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	(3.2)	(2.1)	(8.9)	(6.6)
Change in unrealized gains/losses on derivatives	(5.0)	9.2	(0.5)	8.1
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	(0.5)	(0.6)	(1.6)	(1.7)
Change in pension and other post-employment benefit liability	(0.5)	(0.6)	(1.6)	(1.7)
Other comprehensive income (loss), before tax	37.4	(44.9)	1,002.0	(418.7)
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 post-employment benefit liability	0.2	0.2	0.6	0.6
Other comprehensive income (loss)	(16.1)	15.4	(348.5)	144.4
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	(0.3)	(0.4)	(1.0)	(1.1)
Change in pension and other post-employment benefit liability	(0.3)	(0.4)	(1.0)	(1.1)
Other comprehensive income (loss), after tax	21.3	(29.5)	653.5	(274.3)
Fixed maturities
Available-for-sale securities, Before-Tax Amount:
Change in unrealized gains/losses on securities	93.6	(137.4)	1,460.5	(736.2)
Available-for-sale securities, Income Tax:
Change in unrealized gains/losses on securities	(36.0)	47.7	(509.1)	255.5
Available-for-sale securities, After-Tax Amount:
Change in unrealized gains/losses on securities	57.6	(89.7)	951.4	(480.7)
Equity securities
Available-for-sale securities, Before-Tax Amount:
Change in unrealized gains/losses on securities	0.8	0.0	2.0	(0.1)
Available-for-sale securities, Income Tax:
Change in unrealized gains/losses on securities	(0.3)	0.0	(0.7)	0.0
Available-for-sale securities, After-Tax Amount:
Change in unrealized gains/losses on securities	$ 0.5	$ 0.0	$ 1.3	$ (0.1)

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