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Common Equity - Restricted Shares (Details) - Restricted stock - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restricted Stock Activity
Outstanding, shares, beginning of period	234,627	204,488
Granted, shares		156,340
Released, shares		(121,060)
Forfeited, shares		(5,141)
Outstanding, shares, end of period		234,627	204,488
Restricted Stock Weighted-Average Grant Date Fair Value
Outstanding, weighted-average grant date fair value, beginning of period	$ 61.01	$ 54.94
Granted, weighted-average grant date fair value		64.20
Released, weighted-average grant date fair value		54.97
Forfeited, weighted-average grant date fair value		58.68
Outstanding, weighted-average grant date fair value, end of period		$ 61.01	$ 54.94
Restricted Stock - Additional Disclosures
Intrinsic value of released restricted shares		$ 7.9	$ 5.4	$ 7.7
Tax benefit from released restricted shares		2.2	$ 2.1	$ 3.1
Compensation cost not yet recognized		$ 3.2
Weighted-average period over which unrecognized compensation cost is expected to be recognized		1 year 6 months
Subsequent event
Restricted Stock Activity
Granted, shares	73,571
Restricted Stock Weighted-Average Grant Date Fair Value
Granted, weighted-average grant date fair value	$ 68.18

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Amount of tax benefit from the vesting or payment of awards under share-based compensation arrangements.

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