Derivative Instruments (Fair Values of Derivative Assets and Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Assets
Current	$ 430.7	$ 331.1
Long-term	869.5	1,496.4
Total	1,300.2	1,827.5
Liabilities
Current	217.3	390.4
Long-term	962.5	1,192.3
Total	1,179.8	1,582.7
Cross-currency and interest rate derivative contracts
Assets
Current	97.6	270.8
Long-term	431.9	886.4
Total	529.5	1,157.2
Liabilities
Current	179.7	389.2
Long-term	962.5	1,192.3
Total	1,142.2	1,581.5
Equity-related derivative instruments
Assets
Current	302.7	55.2
Long-term	437.0	608.2
Total	739.7	663.4
Foreign currency forward and option contracts
Assets
Current	30.4	4.6
Long-term	0.3	1.4
Total	30.7	6.0
Liabilities
Current	37.5	1.2
Long-term	0.0	0.0
Total	37.5	1.2
Other
Assets
Current	0.0	0.5
Long-term	0.3	0.4
Total	0.3	0.9
Liabilities
Current	0.1	0.0
Long-term	0.0	0.0
Total	$ 0.1	$ 0.0