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Stock-Based Compensation - Components of stock-based compensation expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense (benefit)	$ 4.9	$ 4.0	$ 16.4	$ 9.4
Accelerated amortization	$ 0.9		$ 4.9
Fair value assumptions and methodology
Expected volatility range of stock, minimum (as a percent)	34.10%		34.10%	58.30%
Expected volatility range of stock, maximum (as a percent)	34.60%		36.20%	66.50%
Risk-free interest range rate, minimum (as a percent)	1.00%		1.00%	0.40%
Risk-free interest range rate, maximum (as a percent)	1.50%		1.50%	1.20%
PRSU expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense (benefit)	$ 3.0	1.6	$ 10.4	$ 1.8
Option expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense (benefit)	1.4	1.8	4.8	5.2
RSU/DSU expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense (benefit)	$ 0.5	$ 0.6	$ 1.2	2.4
PRSU after re-evaluation
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense (benefit)				$ (3.0)
Minimum
Fair value assumptions and methodology
Expected life of option, range in years, minimum	3 years		3 years	2 years
Expected dividend yield on stock, minimum (as a percent)	0.00%		0.00%	0.60%
Maximum
Fair value assumptions and methodology
Expected life of option, range in years, minimum	5 years		5 years	4 years
Expected dividend yield on stock, minimum (as a percent)	0.00%		0.00%	0.70%

X

- Definition

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.

+ References

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Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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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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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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