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Net Income Per Share (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share [Abstract]    
Net income $ 32.9us-gaap_ProfitLoss $ 27.1us-gaap_ProfitLoss
Weighted average common shares outstanding (in shares) 71.7us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 70.6us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of stock options, stock appreciation rights and performance share awards, based on the treasury stock method (in shares) 1.6us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 1.7us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average shares assuming dilution (in shares) 73.3us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 72.3us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Antidilutive options excluded from computation of diluted net income per share (in shares) 0.8us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0.2us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount