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Net Income Per Share (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Earnings Per Share [Abstract] |  |  |
Net income, as reported, for basic net income per share | $ 127.1 us-gaap_ProfitLoss | $ 112.3 us-gaap_ProfitLoss | $ 80.7 us-gaap_ProfitLoss
Plus: interest expense on convertible debt, net of tax | 0 us-gaap_InterestOnConvertibleDebtNetOfTax | 0 us-gaap_InterestOnConvertibleDebtNetOfTax | 2.0 us-gaap_InterestOnConvertibleDebtNetOfTax
Net income for diluted net income per share | 127.1 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | 112.3 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | 82.7 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Weighted average common shares outstanding (in shares) | 70.9 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 69.6 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 68.1 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Assumed stock options exercised and awards vested, based on the treasury stock method (in shares) | 1.9 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 1.7 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 1.1 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Assumed conversion of convertible debt, based on the if-converted method (in shares) | 0 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities | 0.1 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities | 2.6 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
Weighted average shares assuming dilution (in shares) | 72.8 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 71.4 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 71.8 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Antidilutive options excluded from computation of diluted net income per share (in shares) | 0.5 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |  | 1.0 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Stock Repurchase Program, Authorized Amount | $ 100.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |  |

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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 40 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1930-109256 + Details
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- Definition The after-tax amount of interest recognized in the period associated with any convertible debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256 + Details
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- Definition Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256 + Details
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