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Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Income tax expense	$ 5.7	$ 17.8	$ 15.6	$ 53.8
Effective income tax rate, continuing operations	6.20%	22.40%	6.30%	21.70%
Unrecognized tax benefit liability, including penalties and accrued interest	$ 54.4		$ 54.4		$ 30.7
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities				$ 26.1

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Unrecognized tax benefit liability, including penalties and accrued interest

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
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-Section S99
-Paragraph 1
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 10
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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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