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Financing (LYONS) (Narrative) (Details)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
Dec. 31, 2001
USD ($)
Debt Instrument [Line Items]          
Proceeds from borrowings (maturities longer than 90 days)   $ 12,112.8 $ 0.0 $ 1,782.1  
Common stock par value | $ / shares $ 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% 0.00%     2.375%
Debt instrument, convertible, conversion ratio         0.0381998
Debt conversion, converted instrument, shares issued | shares 23,000 935      
Debt conversion, converted instrument, tax benefit (expense)   $ 9.0      
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   $ 1.0 $ 2.0 $ 2.0