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SCHEDULE II SCHEDULE II - BASIS OF PRESENTATION - STATEMENTS OF OPERATION AND CASH FLOWS (DETAILS) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]      
Net income $ 221.0 $ 335.7 $ 240.6
Parent Company [Member]
     
Condensed Financial Statements, Captions [Line Items]      
Equity in undistributed earnings of subsidiaries 455.1 430.1 326.5
Net income 221.0 335.7 240.6
Adjustments for New Accounting Pronouncement [Member]
     
Condensed Financial Statements, Captions [Line Items]      
Net income   (46.8) (44.0)
Adjustments for New Accounting Pronouncement [Member] | Parent Company [Member]
     
Condensed Financial Statements, Captions [Line Items]      
Equity in undistributed earnings of subsidiaries   (46.8) (44.0)
Net income   (46.8) (44.0)
Previously Reported [Member]
     
Condensed Financial Statements, Captions [Line Items]      
Net income   382.5 284.6
Previously Reported [Member] | Parent Company [Member]
     
Condensed Financial Statements, Captions [Line Items]      
Equity in undistributed earnings of subsidiaries   476.9 370.5
Net income   $ 382.5 $ 284.6