Derivative Instruments (Fair Values of Derivative Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Assets:
Current	$ 394.2	$ 494.4
Long-term	2,102.5	1,633.3
Total	2,496.7	2,127.7
Liability:
Current	328.4	223.3
Long-term	1,042.3	1,557.9
Total	1,370.7	1,781.2
Cross Currency Interest Rate Contract
Assets:
Current	372.7	477.0
Long-term	1,370.1	1,071.9
Total	1,742.8	1,548.9
Liability:
Current	326.5	210.2
Long-term	1,042.2	1,557.7
Total	1,368.7	1,767.9
Equity-related derivative instruments
Assets:
Current	13.9	0.0
Long-term	732.4	560.9
Total	746.3	560.9
Liability:
Current	1.4	5.4
Long-term	0.0	0.0
Total	1.4	5.4
Foreign currency forward contracts
Assets:
Current	7.2	17.0
Long-term	0.0	0.1
Total	7.2	17.1
Liability:
Current	0.5	7.7
Long-term	0.0	0.2
Total	0.5	7.9
Other Contract
Assets:
Current	0.4	0.4
Long-term	0.0	0.4
Total	0.4	0.8
Liability:
Current	0.0	0.0
Long-term	0.1	0.0
Total	$ 0.1	$ 0.0