Share-Based Compensation Plan - Performance-Based Equity Awards, Fair Value Assumptions (Details) - Performance-based shares - USD ($)
$ in Millions

Feb. 13, 2019

Feb. 14, 2018

Feb. 15, 2017

Feb. 10, 2016

Jul. 27, 2015

Feb. 11, 2015

Feb. 04, 2014

Dec. 13, 2013

December 13, 2013 | Relative Total Shareholder Return

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Percentage of total award

50.00%

Grant date fair value by component

$ 4.7

Volatility

29.00%

Dividend yield

2.40%

December 13, 2013 | Relative Total Shareholder Return | Minimum

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Interest rate

0.34%

December 13, 2013 | Relative Total Shareholder Return | Maximum

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Interest rate

2.25%

December 13, 2013 | Absolute Total Shareholder Return

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Percentage of total award

50.00%

Grant date fair value by component

$ 2.9

Volatility

29.00%

Dividend yield

2.40%

December 13, 2013 | Absolute Total Shareholder Return | Minimum

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Interest rate

0.34%

December 13, 2013 | Absolute Total Shareholder Return | Maximum

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Interest rate

2.25%

February 4, 2014 | Relative Total Shareholder Return

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Percentage of total award

30.00%

Grant date fair value by component

$ 0.7

Volatility

29.00%

Interest rate

0.62%

Dividend yield

2.40%

February 4, 2014 | Absolute Total Shareholder Return

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Percentage of total award

30.00%

Grant date fair value by component

$ 0.5

Volatility

29.00%

Interest rate

0.62%

Dividend yield

2.40%

February 4, 2014 | EBITDA Comparison

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Percentage of total award

40.00%

Grant date fair value by component

$ 0.8

Volatility

29.00%

Interest rate

0.62%

Dividend yield

2.40%

February 11, 2015 | Relative Total Shareholder Return

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Percentage of total award

30.00%

Grant date fair value by component

$ 0.9

Volatility

22.00%

Interest rate

1.02%

Dividend yield

2.50%

February 11, 2015 | Absolute Total Shareholder Return

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Percentage of total award

40.00%

Grant date fair value by component

$ 0.7

Volatility

22.00%

Interest rate

1.02%

Dividend yield

2.50%

February 11, 2015 | EBITDA Comparison

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Percentage of total award

30.00%

Grant date fair value by component

$ 0.7

Volatility

22.00%

Interest rate

1.02%

Dividend yield

2.50%

July 27, 2015 | Relative Total Shareholder Return

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Percentage of total award

30.00%

Grant date fair value by component

$ 0.0

Volatility

22.00%

Interest rate

0.68%

Dividend yield

2.50%

July 27, 2015 | Absolute Total Shareholder Return

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Percentage of total award

40.00%

Grant date fair value by component

$ 0.0

Volatility

22.00%

Interest rate

0.68%

Dividend yield

2.50%

July 27, 2015 | EBITDA Comparison

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Percentage of total award

30.00%

Grant date fair value by component

$ 0.0

Volatility

22.00%

Interest rate

0.68%

Dividend yield

2.50%

February 10, 2016 | Relative Total Shareholder Return

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Percentage of total award

70.00%

Grant date fair value by component

$ 1.6

Volatility

25.00%

Interest rate

0.71%

Dividend yield

3.00%

February 10, 2016 | Absolute Total Shareholder Return

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Percentage of total award

15.00%

Grant date fair value by component

$ 0.2

Volatility

25.00%

Interest rate

0.71%

Dividend yield

3.00%

February 10, 2016 | EBITDA Comparison

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Percentage of total award

15.00%

Grant date fair value by component

$ 0.4

Volatility

25.00%

Interest rate

0.71%

Dividend yield

3.00%

February 15, 2017 | Relative Total Shareholder Return

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Percentage of total award

65.00%

February 15, 2017 | Absolute Total Shareholder Return

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Percentage of total award

35.00%

February 15, 2017 | Relative and Absolute Total Shareholder Return

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Grant date fair value by component

$ 2.7

Volatility

28.00%

Interest rate

1.27%

Dividend yield

5.60%

February 14, 2018 | Relative Total Shareholder Return

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Percentage of total award

65.00%

February 14, 2018 | Absolute Total Shareholder Return

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Percentage of total award

35.00%

February 14, 2018 | Relative and Absolute Total Shareholder Return

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Grant date fair value by component

$ 3.5

Volatility

28.00%

Interest rate

2.37%

Dividend yield

4.70%

February 13, 2019 | Relative Total Shareholder Return

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Percentage of total award

65.00%

February 13, 2019 | Absolute Total Shareholder Return

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Percentage of total award

35.00%

February 13, 2019 | Relative and Absolute Total Shareholder Return

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Grant date fair value by component

$ 4.5

Volatility

26.00%

Interest rate

2.52%

Dividend yield

4.20%