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Earnings Per Share (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Numerator:
Income from continuing operations	$ 39.5us-gaap_IncomeLossFromContinuingOperations	$ 36.5us-gaap_IncomeLossFromContinuingOperations
Less: dividends declared - common stock outstanding, unvested restricted shares and restricted share units	(16.7)us-gaap_Dividends	(14.2)us-gaap_Dividends
Undistributed earnings	22.8us-gaap_UndistributedEarnings	22.3us-gaap_UndistributedEarnings
Percent allocated to common shareholders	99.50%csl_PercentageOfUndistributedEarningsAllocatedToCommonShareholders	99.50%csl_PercentageOfUndistributedEarningsAllocatedToCommonShareholders
Undistributed earnings allocated to common shareholders	22.7csl_UndistributedEarningsAllocatedToCommonShareholders	22.2csl_UndistributedEarningsAllocatedToCommonShareholders
Add: dividends declared - common stock	16.2us-gaap_DividendsCommonStock	14.1us-gaap_DividendsCommonStock
Numerator for basic and diluted EPS	38.9csl_NetIncomeLossFromContinuingOperationsAvailableToCommonStockholdersBasicAndDiluted	36.3csl_NetIncomeLossFromContinuingOperationsAvailableToCommonStockholdersBasicAndDiluted
Denominator (in thousands):
Denominator for basic EPS: weighted-average common shares outstanding	64,876us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	63,878us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities:
Performance awards (in shares)	220us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares	280us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares
Stock options (in shares)	800us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	931us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Denominator for diluted EPS: adjusted weighted-average common shares outstanding and assumed conversion	65,896us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	65,089us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Per share income from continuing operations:
Basic (in dollars per share)	$ 0.60us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.57us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Diluted (in dollars per share)	$ 0.59us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.56us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Basic weighted-average common shares outstanding	64,876us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	63,878us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic weighted-average common shares outstanding, unvested restricted shares expected to vest and restricted share units	65,210us-gaap_WeightedAverageNumberOfSharesRestrictedStock	64,189us-gaap_WeightedAverageNumberOfSharesRestrictedStock
Percent allocated to common shareholders	99.50%csl_PercentageOfUndistributedEarningsAllocatedToCommonShareholders	99.50%csl_PercentageOfUndistributedEarningsAllocatedToCommonShareholders
Loss from discontinued operations and net income
Loss from discontinued operations attributable to common shareholders for basic and diluted earnings per share	(0.1)csl_NetIncomeLossFromDiscontinuedOperationsAvailableToCommonStockholdersBasicAndDiluted	(0.7)csl_NetIncomeLossFromDiscontinuedOperationsAvailableToCommonStockholdersBasicAndDiluted
Net income attributable to common shareholders for basic and diluted earnings per share	$ 38.8csl_NetIncomeLossAvailableToCommonStockholdersBasicAndDiluted	$ 35.6csl_NetIncomeLossAvailableToCommonStockholdersBasicAndDiluted

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