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Financing (LYONS) (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended 216 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2001
Dec. 31, 2018
Debt Instrument [Line Items]          
Proceeds from borrowings (maturities longer than 90 days) $ 0.0 $ 1,782.1 $ 3,240.9    
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 585       22,000
Debt conversion, converted instrument, tax benefit (expense) $ 5.0        
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 $ 2.0 $ 1.0