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Summary of Significant Accounting Policies (Cash Flow, Supplemental Disclosures) (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Decrease (increase) in Restricted Cash   $ 0.0
Net cash used in investing activities $ (764.2) (445.5)
Net increase in cash, cash equivalents, restricted cash and restricted cash equivalents 129.9 101.8
Cash, cash equivalents, restricted cash and restricted cash equivalents beginning of period 263.8 239.3
Cash, cash equivalents, restricted cash and restricted cash equivalents end of period $ 393.7 341.1
Restatement Adjustment [Member]    
Decrease (increase) in Restricted Cash   89.2
Net cash used in investing activities   89.2
Net increase in cash, cash equivalents, restricted cash and restricted cash equivalents   89.2
Cash, cash equivalents, restricted cash and restricted cash equivalents beginning of period   224.7
Cash, cash equivalents, restricted cash and restricted cash equivalents end of period   313.9
Scenario, Previously Reported [Member]    
Decrease (increase) in Restricted Cash   (89.2)
Net cash used in investing activities   (534.7)
Net increase in cash, cash equivalents, restricted cash and restricted cash equivalents   12.6
Cash, cash equivalents, restricted cash and restricted cash equivalents beginning of period   14.6
Cash, cash equivalents, restricted cash and restricted cash equivalents end of period   $ 27.2