The minimum interest coverage ratio required to be maintained under the terms of the debt agreement.

No definition available.

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- Definition

The maximum leverage ratio allowed under the terms of the debt agreement.

+ References

No definition available.

+ Details

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Data Type:	xbrli:pureItemType
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- Definition

The facility fee on the debt instrument, expressed as a percentage of the total borrowing capacity.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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Balance Type:
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- Details

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Balance Type:
Period Type:

- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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Debt - Credit Agreements (Details) $ in Millions	3 Months Ended
Debt - Credit Agreements (Details) $ in Millions	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Revolving lines of credit
Maximum commitment	$ 763.6
Long-term debt	205.6	$ 415.6
2015 Credit Agreement
Revolving lines of credit
Long-term debt	0.0
2015 Credit Agreement \| US Dollar revolving loan
Revolving lines of credit
Maximum commitment	$ 500.0
Maximum leverage ratio allowed	3.5
Minimum interest coverage ratio required	2.5
2015 Credit Agreement \| US Dollar revolving loan \| Minimum
Revolving lines of credit
Facility fee (as a percent)	0.10%
2015 Credit Agreement \| US Dollar revolving loan \| Maximum
Revolving lines of credit
Facility fee (as a percent)	0.20%
2015 Credit Agreement \| US Dollar revolving loan \| Greatest of prime rate, federal funds rate plus spread and adjusted LIBOR plus spread \| Minimum
Revolving lines of credit
Interest rate added to base rate (as a percent)	0.00%
2015 Credit Agreement \| US Dollar revolving loan \| Greatest of prime rate, federal funds rate plus spread and adjusted LIBOR plus spread \| Maximum
Revolving lines of credit
Interest rate added to base rate (as a percent)	0.30%
2015 Credit Agreement \| US Dollar revolving loan \| Prime rate
Revolving lines of credit
Variable interest rate base	prime rate
2015 Credit Agreement \| US Dollar revolving loan \| Federal funds rate
Revolving lines of credit
Variable interest rate base	federal funds rate
Interest rate added to base rate (as a percent)	0.50%
2015 Credit Agreement \| US Dollar revolving loan \| Adjusted LIBOR
Revolving lines of credit
Variable interest rate base	adjusted LIBOR
Interest rate added to base rate (as a percent)	1.00%
2015 Credit Agreement \| US Dollar revolving loan \| LIBOR
Revolving lines of credit
Variable interest rate base	LIBOR
2015 Credit Agreement \| US Dollar revolving loan \| LIBOR \| Minimum
Revolving lines of credit
Interest rate added to base rate (as a percent)	0.90%
2015 Credit Agreement \| US Dollar revolving loan \| LIBOR \| Maximum
Revolving lines of credit
Interest rate added to base rate (as a percent)	1.30%