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Financing (LYONS) (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended 204 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2001
Dec. 31, 2017
Debt Instrument [Line Items]          
Proceeds from borrowings (maturities longer than 90 days) $ 1,782.1 $ 3,240.9 $ 5,682.9    
Common stock par value $ 0.01 $ 0.01     $ 0.01
Convertible debt | Zero-coupon LYONS due 2021          
Debt Instrument [Line Items]          
Debt instrument, face amount       $ 830.0  
Proceeds from borrowings (maturities longer than 90 days)       505.0  
Repayments of long-term lines of credit       $ 100.0  
Interest rate of debt instrument 0.00%     2.375% 0.00%
Debt instrument, convertible, conversion ratio       0.0381998  
Debt conversion, converted instrument, shares issued 28       21,000
Average market price percentage for measurement period resulting in payment of contingent interest to debt instrument holders       120.00%  
Debt instrument percentage       0.0315%  
Debt Instrument, periodic payment, interest $ 2.0 $ 1.0 $ 1.0