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Fair Value Measurements (Details 4) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
NAV of investments at fair value    
Fair Value $ 197.5 $ 187.8
Unfunded Commitments 71.3 75.4
Fair market value of senior notes 343.1 351.8
Fair market value of 2008 senior convertible notes 531.4 510.6
Fair market value of junior convertible trust preferred securities 852.3 719.9
Private equity fund-of-funds [Member]
    
NAV of investments at fair value    
Fair Value 124.4 [1] 118.9 [1]
Unfunded Commitments 71.3 [1] 75.4 [1]
Other funds [Member]
    
NAV of investments at fair value    
Fair Value 73.1 [2] 68.9 [2]
Unfunded Commitments $ 0 [2] $ 0 [2]
[1] These funds primarily invest in a broad range of private equity funds, as well as making direct investments. Distributions will be received as the underlying assets are liquidated over the life of the funds.
[2] These are multi-disciplinary funds that invest across various asset classes and strategies including long/short equity, credit and real estate. Investments are generally redeemable on a daily or quarterly basis.