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Earnings Per Share Computation of Basic and Diluted Income Per Common Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Numerator:
Net income	$ 90.8us-gaap_NetIncomeLoss	$ 90.1us-gaap_NetIncomeLoss
Less: distributed and undistributed earnings allocated to participating securities	(1.2)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	(1.4)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic
Net income attributable to common shareholders	$ 89.6us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 88.7us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Denominator:
Weighted average basic common shares outstanding	97.1us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	96.8us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities	0.1us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Diluted common shares outstanding	97.2us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	96.8us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic income per common share (in dollars per share)	$ 0.92us-gaap_EarningsPerShareBasic	$ 0.92us-gaap_EarningsPerShareBasic
Diluted income per common share (in dollars per share)	$ 0.92us-gaap_EarningsPerShareDiluted	$ 0.92us-gaap_EarningsPerShareDiluted

X

- Definition

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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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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