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Summary of Significant Accounting Policies (Cash Flow, Supplemental Disclosures) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Increase (Decrease) in Restricted Cash |  | $ 0.0
Net Cash Provided by (Used in) Investing Activities | $ (460.3) | (274.4)
Net increase in cash, cash equivalents, restricted cash and restricted cash equivalents | 116.2 | 88.5
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 | $ 380.0 | 327.8
Restatement Adjustment [Member] |  |
Increase (Decrease) in Restricted Cash |  | 92.0
Net Cash Provided by (Used in) Investing Activities |  | 92.0
Net increase in cash, cash equivalents, restricted cash and restricted cash equivalents |  | 92.0
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 |  | 316.7
Scenario, Previously Reported [Member] |  |
Increase (Decrease) in Restricted Cash |  | (92.0)
Net Cash Provided by (Used in) Investing Activities |  | (366.4)
Net increase in cash, cash equivalents, restricted cash and restricted cash equivalents |  | (3.5)
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 |  | $ 11.1

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 + Details
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- Definition Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 + Details
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- Definition The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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