Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Numerator
Net income	$ 44.0us-gaap_NetIncomeLoss	$ 31.6us-gaap_NetIncomeLoss	$ 129.8us-gaap_NetIncomeLoss	$ 64.7us-gaap_NetIncomeLoss
Denominator
Basic shares outstanding - weighted-average shares outstanding	77.4	76.9	77.2	76.6
Effect of dilutive securities - dilutive stock-based compensation	0.2	0.1	0.2	0.1
Diluted shares outstanding - adjusted weighted-average shares after assumed conversion	77.6	77.0	77.4	76.7
Basic EPS	$ 0.57us-gaap_EarningsPerShareBasic	$ 0.41us-gaap_EarningsPerShareBasic	$ 1.68us-gaap_EarningsPerShareBasic	$ 0.84us-gaap_EarningsPerShareBasic
Diluted EPS	$ 0.57us-gaap_EarningsPerShareDiluted	$ 0.41us-gaap_EarningsPerShareDiluted	$ 1.68us-gaap_EarningsPerShareDiluted	$ 0.84us-gaap_EarningsPerShareDiluted
Antidilutive securities excluded from computation of earnings per share, amount			0.5	2.0
Earnings per share, range of exercise prices of Stock Options excluded from the calculation of diluted EPS, lower end of range	$ 19.54	$ 19.54	$ 19.54	$ 19.54
Earnings per share, range of exercise prices of Stock Options excluded from the calculation of diluted EPS, upper end of range	$ 26.65	$ 40.83	$ 26.65	$ 40.83

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Represents the lower end of the range of exercise prices of stock options excluded from the calculation of diluted EPS during the period because the exercise price of these stock options was greater than the average annual market price of our stock.

+ References

No definition available.

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- Definition

Represents the upper end of the range of exercise prices of stock options excluded from the calculation of diluted EPS during the period because the exercise price of these stock options was greater than the average annual market price of our stock.

+ References

No definition available.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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- Definition

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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