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Restructuring Charges (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]                          
Stock-based compensation $ 1.7us-gaap_ShareBasedCompensation $ 2.6us-gaap_ShareBasedCompensation $ 1.6us-gaap_ShareBasedCompensation $ 1.6us-gaap_ShareBasedCompensation $ 1.4us-gaap_ShareBasedCompensation $ 1.5us-gaap_ShareBasedCompensation $ 1.5us-gaap_ShareBasedCompensation $ 1.3us-gaap_ShareBasedCompensation $ 10.9us-gaap_ShareBasedCompensation $ 5.8us-gaap_ShareBasedCompensation $ 7.5us-gaap_ShareBasedCompensation [1] $ 5.7us-gaap_ShareBasedCompensation [1] $ 5.0us-gaap_ShareBasedCompensation [1]
Restructuring reserve 0us-gaap_RestructuringReserve       1.1us-gaap_RestructuringReserve       2.5us-gaap_RestructuringReserve   0us-gaap_RestructuringReserve 1.1us-gaap_RestructuringReserve  
Restructuring charges         0.1us-gaap_RestructuringCharges 1.9us-gaap_RestructuringCharges 0.5us-gaap_RestructuringCharges 0us-gaap_RestructuringCharges 6.2us-gaap_RestructuringCharges [2] 0us-gaap_RestructuringCharges [2] 0us-gaap_RestructuringCharges 2.5us-gaap_RestructuringCharges 3.0us-gaap_RestructuringCharges
Restructuring Charges                          
Restructuring Cost and Reserve [Line Items]                          
Stock-based compensation                 $ 3.5us-gaap_ShareBasedCompensation
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_RestructuringChargesMember		 [2]        
[1] (a)Stock-based compensation is classified as a Corporate expense.
[2] Restructuring charges (including stock-based compensation of $3.5 million), costs related to the Acquisition and stock-based compensation are classified as Corporate expense.