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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Transfers of Assets, Levels 1 to Level 2 $ 0   $ 0
Transfer of Assets, Level 2 to Level 1 0   0
Transfer of Liabilities, Level 1 to Level 2 0   0
Transfers of Liabilities, Levels 2 to Level 1 0   0
Recurring [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 756,800,000 $ 869,100,000  
Investments at fair value 2,378,000,000 1,795,600,000  
Embedded contractual derivative asset 9,500,000 10,000,000  
Total assets at fair value 3,144,300,000 2,674,700,000  
Embedded contractual derivative liability 9,800,000 2,600,000  
Total liabilities at fair value 9,800,000 2,600,000  
Recurring [Member] | Residential Mortgage-Backed Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 242,200,000 210,900,000  
Recurring [Member] | Commercial Mortgage-Backed Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 215,900,000 146,200,000  
Recurring [Member] | Other Asset-Backed Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 164,700,000 81,400,000  
Recurring [Member] | U.S. Treasury Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 28,200,000 36,500,000  
Recurring [Member] | U.S. Agency Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 0 0  
Recurring [Member] | Obligations of States and Other Political Subdivisions [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 981,500,000 732,200,000  
Recurring [Member] | Corporate Debt Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 745,500,000 588,400,000  
Recurring [Member] | Level 1 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 756,800,000 869,100,000  
Investments at fair value 28,200,000 36,500,000  
Embedded contractual derivative asset 0 0  
Total assets at fair value 785,000,000 905,600,000  
Recurring [Member] | Level 1 [Member] | Residential Mortgage-Backed Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 0 0  
Recurring [Member] | Level 1 [Member] | Commercial Mortgage-Backed Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 0 0  
Recurring [Member] | Level 1 [Member] | Other Asset-Backed Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 0 0  
Recurring [Member] | Level 1 [Member] | U.S. Treasury Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 28,200,000 36,500,000  
Recurring [Member] | Level 1 [Member] | U.S. Agency Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 0 0  
Recurring [Member] | Level 1 [Member] | Obligations of States and Other Political Subdivisions [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 0 0  
Recurring [Member] | Level 1 [Member] | Corporate Debt Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 0 0  
Recurring [Member] | Level 2 [Member] | Current Assets [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 0 0  
Investments at fair value 2,343,300,000 1,754,500,000  
Embedded contractual derivative asset 0 0  
Total assets at fair value 2,343,300,000 1,754,500,000  
Recurring [Member] | Level 2 [Member] | Current Assets [Member] | Residential Mortgage-Backed Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 242,200,000 210,900,000  
Recurring [Member] | Level 2 [Member] | Current Assets [Member] | Commercial Mortgage-Backed Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 215,500,000 145,600,000  
Recurring [Member] | Level 2 [Member] | Current Assets [Member] | Other Asset-Backed Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 164,700,000 81,400,000  
Recurring [Member] | Level 2 [Member] | Current Assets [Member] | U.S. Treasury Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 0 0  
Recurring [Member] | Level 2 [Member] | Current Assets [Member] | U.S. Agency Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 0 0  
Recurring [Member] | Level 2 [Member] | Current Assets [Member] | Obligations of States and Other Political Subdivisions [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 980,000,000 732,200,000  
Recurring [Member] | Level 2 [Member] | Current Assets [Member] | Corporate Debt Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 740,900,000 584,400,000  
Recurring [Member] | Level 2 [Member] | Noncurrent Assets [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 0 0  
Investments at fair value 6,500,000 4,600,000  
Embedded contractual derivative asset 0 0  
Total assets at fair value 6,500,000 4,600,000  
Recurring [Member] | Level 2 [Member] | Noncurrent Assets [Member] | Residential Mortgage-Backed Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 0 0  
Recurring [Member] | Level 2 [Member] | Noncurrent Assets [Member] | Commercial Mortgage-Backed Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 400,000 600,000  
Recurring [Member] | Level 2 [Member] | Noncurrent Assets [Member] | Other Asset-Backed Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 0 0  
Recurring [Member] | Level 2 [Member] | Noncurrent Assets [Member] | U.S. Treasury Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 0 0  
Recurring [Member] | Level 2 [Member] | Noncurrent Assets [Member] | U.S. Agency Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 0 0  
Recurring [Member] | Level 2 [Member] | Noncurrent Assets [Member] | Obligations of States and Other Political Subdivisions [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 1,500,000 0  
Recurring [Member] | Level 2 [Member] | Noncurrent Assets [Member] | Corporate Debt Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 4,600,000 4,000,000  
Recurring [Member] | Level 3 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 0 0  
Investments at fair value 0 0  
Embedded contractual derivative asset 9,500,000 10,000,000  
Total assets at fair value 9,500,000 10,000,000  
Embedded contractual derivative liability 9,800,000 2,600,000  
Total liabilities at fair value 9,800,000 2,600,000 $ 0
Recurring [Member] | Level 3 [Member] | Residential Mortgage-Backed Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 0 0  
Recurring [Member] | Level 3 [Member] | Commercial Mortgage-Backed Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 0 0  
Recurring [Member] | Level 3 [Member] | Other Asset-Backed Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 0 0  
Recurring [Member] | Level 3 [Member] | U.S. Treasury Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 0 0  
Recurring [Member] | Level 3 [Member] | U.S. Agency Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 0 0  
Recurring [Member] | Level 3 [Member] | Obligations of States and Other Political Subdivisions [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value 0 0  
Recurring [Member] | Level 3 [Member] | Corporate Debt Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments at fair value $ 0 $ 0