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Segment Information (Revenue and Long-Lived Assets by Geographic Location) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 1,040.2 | $ 1,142.7 | $ 940.8 | $ 1,005.3 | $ 1,256.1 | $ 752.3 | $ 639.5 | $ 553.6 | $ 4,129.1 | $ 3,201.5 | $ 2,347.4
Long-Lived Assets | [1] | 1,859.1 |  |  |  | 1,904.0 |  |  |  | 1,859.1 | 1,904.0 |
Canada |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 48.3 | 56.0 | 55.1
Long-Lived Assets | [1] | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 | 0.0 |
United States |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 3,383.0 | 2,431.9 | 1,550.2
Long-Lived Assets | [1] | 1,824.5 |  |  |  | 1,870.8 |  |  |  | 1,824.5 | 1,870.8 |
Other Foreign |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 697.8 | 713.6 | $ 742.1
Long-Lived Assets | [1] | $ 34.6 |  |  |  | $ 33.2 |  |  |  | $ 34.6 | $ 33.2 |
[1] | Long-lived assets represents total assets less the following: current assets, investments, long-term receivables, intangible assets, goodwill and deferred tax assets.

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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