Summary of Significant Accounting Policies Stock Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum Number of Common Stock Shares Available Under New Stock Option Plan	14,500,000
Share contractual period	10 years
Number of shares available for future issuances	10,877,713
Award vesting rate, within one year of grant date	10.00%
Award vesting rate, between year one and year two	15.00%
Award vesting rate, between year two and year three	20.00%
Award vesting rate, between year three and year four	25.00%
Award vesting rate, between year four and year five	30.00%
Share-based compensation expense	$ 1.6		$ 1.7		$ 3.0
Income tax benefit	0.5		0.6		1.0
Expected volatility	33.00%		32.00%		31.00%
Expected dividends	5.99%		6.88%		5.95%
Expected term (in years)	7 years		7 years		7 years
Risk-free rate	1.19%		1.74%		2.73%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, outstanding at beginning of year	14,293,149		15,679,915		16,560,483
Granted	922,500		974,500		1,064,500
Exercised	897,909		14,850		31,113
Forfeited and canceled	1,510,468		2,346,416		1,913,955
Options, outstanding at end of year	12,807,272		14,293,149		15,679,915
Exercisable at end of year	10,582,298		12,032,624		13,262,682
Options, outstanding, weighted average exercise price	$ 16.97		$ 16.75		$ 17.25		$ 17.39
Granted, Weighted Average Exercise Price	$ 12.57		$ 10.80		$ 12.33
Exercised, Weighted Average Exercise Price	$ 12.22		$ 10.48		$ 12.22
Forfeited and canceled, Weighted Average Exercise Price	$ 15.01		$ 17.66		$ 15.85
Exercisable at end of year, Weighted Average Exercise Price	$ 18.03		$ 17.74		$ 18.21
Weighted average fair value of options granted during the year	$ 1.94	[1]	$ 1.46	[1]	$ 1.99	[1]
Total unrecognized compensation cost	1.6
Unrecognized stock compensation costs, weighted average remaining contractual term	3 years
Cash received from stock option exercise	10.9		0.1		0.3
Intrinsic value of stock options exercised	2.9		0		0
Actual tax benefit realized for tax deductions from stock options exercised	$ 1.1		$ 0		$ 0
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Restricted common stock vesting period			3 years
Range of Exercise Prices, $19.32 to $20.02 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, outstanding at end of year	1,850,852
Exercisable at end of year	1,850,852
Options, outstanding, weighted average exercise price	$ 19.33
Exercisable at end of year, Weighted Average Exercise Price	$ 19.33
Options, Outstanding, Weighted Average Remaining Contractual Life	0 years 3 months
Range of Exercise Prices,$18.41 to $20.87 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, outstanding at end of year	1,572,059
Exercisable at end of year	1,572,059
Options, outstanding, weighted average exercise price	$ 18.45
Exercisable at end of year, Weighted Average Exercise Price	$ 18.45
Options, Outstanding, Weighted Average Remaining Contractual Life	1 year 3 months
Range of Exercise Prices, $21.36 to $22.35 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, outstanding at end of year	2,089,525
Exercisable at end of year	2,089,525
Options, outstanding, weighted average exercise price	$ 22.00
Exercisable at end of year, Weighted Average Exercise Price	$ 22.00
Options, Outstanding, Weighted Average Remaining Contractual Life	2 years 3 months
Range of Exercise Prices, $21.78 to $23.16 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, outstanding at end of year	1,971,475
Exercisable at end of year	1,971,475
Options, outstanding, weighted average exercise price	$ 21.78
Exercisable at end of year, Weighted Average Exercise Price	$ 21.78
Options, Outstanding, Weighted Average Remaining Contractual Life	3 years 3 months
Range of Exercise Prices, $7.73 to $12.95 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, outstanding at end of year	1,048,370
Exercisable at end of year	1,048,370
Options, outstanding, weighted average exercise price	$ 12.93
Exercisable at end of year, Weighted Average Exercise Price	$ 12.93
Options, Outstanding, Weighted Average Remaining Contractual Life	4 years 3 months
Range of Exercise Prices, $10.48 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, outstanding at end of year	698,133
Exercisable at end of year	698,133
Options, outstanding, weighted average exercise price	$ 10.48
Exercisable at end of year, Weighted Average Exercise Price	$ 10.48
Options, Outstanding, Weighted Average Remaining Contractual Life	5 years 3 months
Range of Exercise Prices, $12.08 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, outstanding at end of year	690,225
Exercisable at end of year	490,234
Options, outstanding, weighted average exercise price	$ 12.08
Exercisable at end of year, Weighted Average Exercise Price	$ 12.08
Options, Outstanding, Weighted Average Remaining Contractual Life	6 years 3 months
Range of Exercise Prices, $10.51 to $14.31 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, outstanding at end of year	67,745	[2]
Exercisable at end of year	67,745	[2]
Options, outstanding, weighted average exercise price	$ 12.96	[2]
Exercisable at end of year, Weighted Average Exercise Price	$ 12.96	[2]
Options, Outstanding, Weighted Average Remaining Contractual Life	0 years 3 months	[2]
Range of Exercise Prices, $12.33 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, outstanding at end of year	945,413
Exercisable at end of year	442,146
Options, outstanding, weighted average exercise price	$ 12.33
Exercisable at end of year, Weighted Average Exercise Price	$ 12.33
Options, Outstanding, Weighted Average Remaining Contractual Life	7 years 3 months
Range of Exercise Prices, $10.80 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, outstanding at end of year	953,475
Exercisable at end of year	246,711
Options, outstanding, weighted average exercise price	$ 10.80
Exercisable at end of year, Weighted Average Exercise Price	$ 10.80
Options, Outstanding, Weighted Average Remaining Contractual Life	8 years 3 months
Range of Exercise Prices, $12.57 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, outstanding at end of year	920,000
Exercisable at end of year	105,048
Options, outstanding, weighted average exercise price	$ 12.57
Exercisable at end of year, Weighted Average Exercise Price	$ 12.57
Options, Outstanding, Weighted Average Remaining Contractual Life	9 years 3 months

[1] Based on the Black-Scholes option pricing model and the assumptions outlined above.

[2] (a) Represents the replacement options issued pursuant to the PMA merger.