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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Compensation Expense for Company's Non-Qualified Stock Options, Non-Vested Stock Awards
The table below summarizes compensation expense for the Company’s non-qualified stock options based on the fair value method estimated using the Black-Scholes valuation model, and non-vested stock awards, including restricted stock units, and performance-based non-vested stock units based on the fair value method estimated using the Monte Carlo simulation model and the grant date stock market value for the years ended December 31, 2017, 2016 and 2015. The Company records compensation expense related to non-vested stock awards as a component of the SG&A expenses caption in the Consolidated Statements of Operations and Comprehensive Income (Loss).
 
Year Ended
 (in millions)
Dec 31, 2017
 
Dec 31, 2016
 
Dec 31, 2015
Non-qualified stock option expense
$
0.9

 
$
0.6

 
$
1.5

Stock unit awards
4.3

 
3.4

 
4.5

Performance-based non-vested stock awards expense
5.4

 
1.4

 
6.1

Total pre-tax share-based compensation expense
$
10.6

 
$
5.4

 
$
12.1

Excess tax benefit (deficiency) on share-based compensation
$
(0.7
)
 
$
(5.0
)
 
$
(1.7
)
Schedule of Share-based Compensation, Stock Options, Activity
A summary of stock option activity for the year ended December 31, 2017 is as follows (options in thousands and aggregate intrinsic value in millions):
 
 
 
Weighted
Average
 
Weighted Average
Remaining
 
Aggregate
 
Options
Outstanding
 
Exercise
Price
 
Contractual
Term
 
Intrinsic
Value
Outstanding as of December 31, 2016
1,679.6

 
$
31.01

 
4.3 years
 
$
—

Granted
177.4

 
16.79

 
 
 
 
Exercised
(470.0
)
 
21.34

 
 
 
 
Forfeited or Expired
(271.8
)
 
39.53

 
 
 
 
Outstanding as of December 31, 2017
1,115.2

 
$
30.75

 
5.5 years
 
$
5.6

Exercisable at December 31, 2017
832.9

 
$
35.07

 
4.4 years
 
$
2.3

Options expected to vest in the next twelve months
172.3

 
$
18.74

 
8.9 years
 
$
1.9
Schedule of Valuation Assumptions
The fair value of each option award is estimated on the date of grant using the Black-Scholes valuation model. The weighted-average assumptions for the stock options granted in the years ended December 31, 2017 and 2015 are as follows (during the year ended December 31, 2016 there were no stock options granted):
 
 
Year Ended
 
 
Dec 31, 2017
 
Dec 31, 2015
Risk-free interest rate (1)
 
2.1
%
 
1.4
%
Expected dividend yield
 
4.3
%
 
3.7
%
Expected option life (2)
 
6.0 years

 
4.0 years

Expected stock price volatility (3)
 
50.7
%
 
47.2
%
Weighted average fair value of options granted
 
$
5.60

 
$
5.68

(1)
Risk-free interest rate — This is the U.S. Treasury rate at the grant date having a term approximately equal to the expected life of the option. An increase in the risk-free interest rate will increase compensation expense.
(2)
Expected option life — This is the period of time over which the options granted are expected to remain outstanding and is based on historical experience. Options granted have a maximum term of ten years. An increase in expected life will increase compensation expense.
(3)
Expected stock price volatility — This is a measure of the amount by which a price has fluctuated or is expected to fluctuate. The Company uses actual historical changes in the market value of the Company’s stock to calculate the volatility assumption as it is management’s belief that this is the best indicator of future volatility. An increase in the expected volatility will increase compensation expense.
Shares Authorized under Stock Option Plans, by Exercise Price Range
Additional information regarding options outstanding as of December 31, 2017 is as follows (options in thousands):
Range of Option Prices
 
Options Outstanding
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Life
 
Options Exercisable
 
Weighted Average Exercise Price
$0 -$14
 
—

 
$
—

 
0.0
 
—

 
$
—

$14 - $28
 
517.0

 
18.74

 
8.0
 
234.7

 
19.65

$28 -$42
 
325.0

 
33.01

 
1.2
 
325.0

 
33.01

$42 - $56
 
169.0

 
42.87

 
1.0
 
169.0

 
42.87

$56 - $70
 
104.2

 
63.64

 
0.1
 
104.2

 
63.64
Schedule of Nonvested Restricted Stock Units Activity
A summary of all nonvested stock activity for the year ended December 31, 2017, is as follows (shares in thousands):
 
Shares Outstanding
 
Weighted Average Grant Date Fair Value
Balance, December 31, 2016
1,438.8

 
$
13.87

Granted
817.5

 
16.83

Vested
(875.4
)
 
17.39

Forfeited
(233.4
)
 
11.83

Balance, December 31, 2017
1,147.5

 
$
13.54
Schedule of Nonvested Share Activity
The weighted-average grant date fair value of all nonvested stock granted, the total fair value (in millions) of all nonvested stock granted, and the fair value (in millions) of all nonvested stock that have vested during each of the past three years is as follows:
 
Year Ended
 
Dec 31, 2017
 
Dec 31, 2016
 
Dec 31, 2015
Weighted-average grant date fair value of nonvested shares granted
$
16.83

 
$
7.96

 
$
15.97

Fair value of nonvested shares granted
$
13.8

 
$
9.2

 
$
15.2

Fair value of shares vested
$
15.2

 
$
14.2

 
$
8.7