Share-Based Compensation Plans - Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	$ 9.5	$ 14.1	$ 17.3
Income tax benefit	(3.0)	(4.6)	(5.6)
Share-based payment expense, net of tax	6.5	9.5	11.7
Fair value of shares vested	22.2	6.6	4.5
Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	4.1	8.1	6.8
Unrecognized Expense for Nonvested Awards at	$ 9.2
Weighted-average No. of Years Unrecognized Expense to be Recognized	2 years 11 days
Fair value of shares vested	$ 8.2	0.0	0.0
Market Share Units MSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	0.1	2.3	1.6
Unrecognized Expense for Nonvested Awards at	$ 0.3
Weighted-average No. of Years Unrecognized Expense to be Recognized	1 year 1 month 15 days
Fair value of shares vested	$ 2.7	0.0	0.0
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	3.8	3.2	6.0
Unrecognized Expense for Nonvested Awards at	$ 3.7
Weighted-average No. of Years Unrecognized Expense to be Recognized	1 year 9 months 9 days
Fair value of shares vested	$ 4.1	5.3	4.1
Deferred Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	0.9	0.5	0.6
Unrecognized Expense for Nonvested Awards at	$ 0.3
Weighted-average No. of Years Unrecognized Expense to be Recognized	4 months 4 days
Fair value of shares vested	$ 1.9	0.2	0.3
Performance-based Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	0.6	0.0	0.0
Unrecognized Expense for Nonvested Awards at	$ 2.9
Weighted-average No. of Years Unrecognized Expense to be Recognized	2 years 5 months 22 days
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	$ 0.0	0.0	2.3
Unrecognized Expense for Nonvested Awards at	$ 0.0
Weighted-average No. of Years Unrecognized Expense to be Recognized	0 days
Fair value of shares vested	$ 5.3	$ 1.1	$ 0.1

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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-Publisher FASB
-Name Accounting Standards Codification
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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