Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2016

Employee benefit plans [Line Items]

Restricted Stock Award Activity

Restricted Stock Award Activity

Nonvested Shares	Number of Shares		Weighted Average Grant Date Fair Value Per Share
Nonvested at December 31, 2015	62,145		$	25.67
Granted	58,858		25.57
Vested	(62,145	)	25.67
Forfeited	—		—
Nonvested at December 31, 2016	58,858		$	25.57

Stock Purchase Plan

Stock Purchase Plan

	Year Ended December 31,
	2016		2015		2014
	(dollars in millions)
Proceeds from purchase of shares by employees	$	0.9	$	0.8	$	0.9
Number of shares issued by the Company	39,055		38,565		43,273
Recorded in share-based compensation, net of deferral	$	0.2	$	0.2	$	0.2

Share-Based Compensation Expense Summary

Share‑Based Compensation Expense Summary

	Year Ended December 31,
	2016		2015		2014
	(in millions)
Share‑based compensation expense	$	13	$	10	$	10
Share‑based compensation capitalized as DAC	0.4		0.5		0.3
Income tax benefit	3		2		2

Stock Options [Member]

Employee benefit plans [Line Items]

Schedule of Stock Options

Time Vested Stock Options

	Options for Common Shares		Weighted Average Exercise Price		Number of Exercisable Options
Balance as of December 31, 2015	2,360,340		$	21.73	2,275,096
Options granted	—		—
Options exercised	(768,212	)	24.64
Options forfeited/expired	(421,535	)	25.50
Balance as of December 31, 2016	1,170,593		$	18.43	1,145,356

Schedule of Weighted Average Assumptions on Option Pricing

Lattice Option Pricing

Weighted Average Assumptions (1)

	2014
Dividend yield	2.03		%
Expected volatility	53.24		%
Risk free interest rate	2.21		%
Expected life	6.6 years
Forfeiture rate	3.5		%
Weighted average grant date fair value	$	10.35

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(1) No options were granted in 2016 and 2015.

Performance Stock Options [Member]

Employee benefit plans [Line Items]

Schedule of Stock Options

Performance Stock Options

	Options for Common Shares		Weighted Average Exercise Price		Number of Exercisable Options
Balance as of December 31, 2015	239,537		$	17.92	166,897
Options granted	—		—
Options exercised	(5,533	)	19.08
Options forfeited/expired	(12,595	)	19.24
Balance as of December 31, 2016	221,409		$	17.89	221,409

Restricted Stock Units [Member]

Employee benefit plans [Line Items]

Restricted Stock Unit Activity (Excluding Dividend Equivalents)

Restricted Stock Unit Activity

Nonvested Stock Units	Number of Stock Units		Weighted Average Grant Date Fair Value Per Share
Nonvested at December 31, 2015	689,281		$	23.23
Granted	377,661		24.51
Vested	(114,701	)	20.88
Forfeited	(6,732	)	24.38
Nonvested at December 31, 2016	945,509		$	24.01

Performance Restricted Stock Units [Member]

Employee benefit plans [Line Items]

Restricted Stock Unit Activity (Excluding Dividend Equivalents)

Performance Restricted Stock Unit Activity

Performance Restricted Stock Units	Number of Performance Share Units		Weighted Average Grant Date Fair Value Per Share
Nonvested at December 31, 2015	408,260		$	27.32
Granted	270,612		25.62
Delivered	(69,437	)	29.43
Forfeited	—		—
Nonvested at December 31, 2016 (1)	609,435		$	26.22

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(1) Excludes 355,353 performance restricted stock units that have met performance hurdles and will be eligible for vesting after December 31, 2016.