Annual report pursuant to Section 13 and 15(d)

Basis of Presentation - Common Share Amounts Used to Compute Basic and Diluted Earnings per Share (Detail)

v2.4.1.9
Basis of Presentation - Common Share Amounts Used to Compute Basic and Diluted Earnings per Share (Detail)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Share [Abstract]      
Weighted average shares used in basic computations 86.3us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 102.6us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 112.4us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of exercise of equity grants outstanding 4.5us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 4.8us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 5.5us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average shares used in diluted computations 90.8us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 107.4us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 117.9us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding