Accumulated Other Comprehensive Income (Loss) - Changes in AOCI, including Reclassification Adjustments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Available-for-sale securities, Before-Tax Amount:
Change in unrealized gains/losses on Other	$ 0	$ 0.1
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	2.8	(2.9)
DAC/VOBA and sales inducements	(79.9)	(134.1)
Premium deficiency reserve adjustment	(8.1)	(23.9)
Change in unrealized gains/losses on available-for-sale securities	190.7	299.0
Available-for-sale securities, Income Tax:
Change in unrealized gains/losses on Other	0	0
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	(1.0)	1.0
DAC/VOBA and sales inducements	28.0	46.9
Premium deficiency reserve adjustment	2.8	8.4
Change in unrealized gains/losses on available-for-sale securities	(66.1)	(104.4)
Available-for-sale securities, After-Tax Amount:
Change in unrealized gains/losses on Other	0	0.1
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	1.8	(1.9)
DAC/VOBA and sales inducements	(51.9)	(87.2)
Premium deficiency reserve adjustment	(5.3)	(15.5)
Change in unrealized gains/losses on available-for-sale securities	124.6	194.6
Derivatives, Before-Tax Amount:
Change in unrealized capital gains/losses arising during the period, Before-Tax Amount	20.9	24.9
Adjustments for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	(3.9)	(1.4)
Change in unrealized gains/losses on derivatives	17.0	23.5
Derivatives, Income Tax:
Change in unrealized capital gains/losses arising during the period, Income Tax	(7.3)	(8.7)
Adjustments for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	1.4	0.5
Change in unrealized gains/losses on derivatives	(5.9)	(8.2)
Derivatives, After-Tax Amount:
Change in unrealized capital gains/losses arising during the period, After-Tax Amount	13.6	16.2
Adjustments for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	(2.5)	(0.9)
Change in unrealized gains/losses on derivatives	11.1	15.3
OTTI:
Other-than-temporary impairments	1.2	6.6
Change in OTTI, Income Tax	(0.4)	(2.3)
Change in OTTI, After-Tax Amount	0.8	4.3
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)	(0.6)
Change in pension and other post-employment benefit liability	(0.6)	(0.6)
Other comprehensive income (loss), before tax	207.1	321.9
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
Change in pension and other post-employment benefit liability	0.2	0.2
Other comprehensive income (loss)	(71.8)	(112.4)
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	(0.4)	(0.4)
Change in pension and other post-employment benefit liability	(0.4)	(0.4)
Other comprehensive income (loss), after tax	135.3	209.5
Fixed maturities
Available-for-sale securities, Before-Tax Amount:
Change in unrealized gains/losses on securities	273.3	452.8
Available-for-sale securities, Income Tax:
Change in unrealized gains/losses on securities	(95.0)	(158.3)
Available-for-sale securities, After-Tax Amount:
Change in unrealized gains/losses on securities	178.3	294.5
Equity securities
Available-for-sale securities, Before-Tax Amount:
Change in unrealized gains/losses on securities	1.4	0.4
Available-for-sale securities, Income Tax:
Change in unrealized gains/losses on securities	(0.5)	(0.1)
Available-for-sale securities, After-Tax Amount:
Change in unrealized gains/losses on securities	$ 0.9	$ 0.3

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