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Investment Securities - Amortized Cost and Approximate Fair Values of Investment Securities (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Available-for-Sale:
Amortized Cost	$ 2,596.5	$ 2,305.2
Gross Unrealized Gains	19.7	2.6
Gross Unrealized Losses	(6.5)	(37.1)
Estimated Fair Value	2,609.7	2,270.7
Held-to-Maturity:
Amortized Cost	98.8	406.8
Gross Unrealized Gains	2.1	2.2
Gross Unrealized Losses	(0.1)	(8.3)
Estimated Fair Value	100.8	400.7
U.S. Treasury Notes
Available-for-Sale:
Amortized Cost	9.0	2.6
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Estimated Fair Value	9.0	2.6
State, county and municipal securities
Available-for-Sale:
Amortized Cost	80.2
Gross Unrealized Gains	1.0
Gross Unrealized Losses	0.0
Estimated Fair Value	81.2
Held-to-Maturity:
Amortized Cost	63.5	150.9
Gross Unrealized Gains	2.1	1.8
Gross Unrealized Losses	0.0	(0.9)
Estimated Fair Value	65.6	151.8
Obligations of U.S. government agencies
Available-for-Sale:
Amortized Cost	583.0	569.3
Gross Unrealized Gains	0.5	0.1
Gross Unrealized Losses	(1.3)	(10.2)
Estimated Fair Value	582.2	559.2
Held-to-Maturity:
Amortized Cost	19.8	19.8
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.1)	(0.3)
Estimated Fair Value	19.7	19.5
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations
Available-for-Sale:
Amortized Cost	1,761.9	1,566.4
Gross Unrealized Gains	17.6	2.5
Gross Unrealized Losses	(4.7)	(24.1)
Estimated Fair Value	1,774.8	1,544.8
Held-to-Maturity:
Amortized Cost	1.3	189.7
Gross Unrealized Gains	0.0	0.3
Gross Unrealized Losses	0.0	(6.5)
Estimated Fair Value	1.3	183.5
Private mortgage-backed securities
Available-for-Sale:
Amortized Cost	61.1	72.0
Gross Unrealized Gains	0.1	0.0
Gross Unrealized Losses	(0.5)	(1.8)
Estimated Fair Value	60.7	70.2
Corporate securities
Available-for-Sale:
Amortized Cost	94.5	92.9
Gross Unrealized Gains	0.5	0.0
Gross Unrealized Losses	0.0	(1.0)
Estimated Fair Value	95.0	91.9
Held-to-Maturity:
Amortized Cost	14.1	46.3
Gross Unrealized Gains	0.0	0.1
Gross Unrealized Losses	0.0	(0.6)
Estimated Fair Value	14.1	45.8
Other investments
Available-for-Sale:
Amortized Cost	6.8	2.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Estimated Fair Value	6.8	2.0
Other Investments
Held-to-Maturity:
Amortized Cost	0.1	0.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Estimated Fair Value	$ 0.1	$ 0.1

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